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2020

Schema Compliant Consistency Management via Triple Graph Grammars and Integer Linear Programming

N. Weidmann, A. Anjorin, in: Fundamental Approaches to Software Engineering, 2020


Development Framework for Context-Aware Augmented Reality Applications

S.C. Krings, E. Yigitbas, I. Jovanovikj, S. Sauer, G. Engels, in: Proceedings of the 12th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2020), 2020


Modeling and Analyzing Architectural Diversity of Open Platforms

B. Jazayeri, S. Schwichtenberg, J. Küster, O. Zimmermann, G. Engels, in: Advanced Information Systems Engineering, 2020


Integrated Model-driven Development of Self-adaptive User Interfaces

E. Yigitbas, I. Jovanovikj, K. Biermeier, S. Sauer, G. Engels, International Journal on Software and Systems Modeling (SoSyM) (2020)



On the Development of Context-aware Augmented Reality Applications (to appear)

E. Yigitbas, I. Jovanovikj, S. Sauer, G. Engels, in: Handling Security, Usability, User Experience and Reliability in User-Centered Development Processes - IFIP WG 13.2/13.5, Springer, LNCS, 2020


Challenges in Model-Driven Development of Multi-Platform Augmented Reality Applications (to appear)

I. Jovanovikj, E. Yigitbas, S. Sauer, G. Engels, Softwaretechnik-Trends, Proceedings of the 22st Workshop Software-Reengineering & Evolution (WSRE) & 11h Workshop Design for Future (DFF) (2020)


Concept-based Co-Migration of Test Cases

I. Jovanovikj, E. Yigitbas, S. Sauer, G. Engels, in: Proceedings of the 8th International Conference on Model-Driven Engineering and Software Development - Volume 1: MODELSWARD, 2020


Experiencing and Programming the ENIAC in VR

E. Yigitbas, C.B. Tejedor, G. Engels, in: Proceedings of the Mensch und Computer 2020 (MuC ’20), 2020


ProConAR: A Tool Support for Model-based AR Product Configuration (to appear)

S. Gottschalk, E. Yigitbas, E. Schmidt, G. Engels, in: Proceedings of the 8th International Working Conference on Human-Centered Software Engineering (HCSE'20), 2020


An Augmented and Virtual Reality Object Repository for Rapid Prototyping (to appear)

I. Jovanovikj, E. Yigitbas, S. Sauer, G. Engels, in: Proceedings of the 8th International Working Conference on Human-Centered Software Engineering (HCSE'20), 2020


Test Case Co-Migration Method Patterns

I. Jovanovikj, E. Yigitbas, S. Sauer, G. Engels, Software Engineering 2020 Workshopband (2020)


VR Training for Warehouse Management

E. Yigitbas, I. Jovanovikj, J. Scholand, G. Engels, in: Proceedings of the 26th ACM Symposium on Virtual Reality Software and Technology (VRST) (to appear), ACM, 2020


UCAI 2020 - 1st International Workshop on User-Centered Artificial Intelligence

M. Augstein, D. Buschek, E. Herder, B. Loepp, E. Yigitbas, J. Ziegler, in: Proceedings of the Mensch und Computer 2020 (MuC ’20), ACM, 2020


Validating Test Case Migration via Mutation Analysis (to appear)

I. Jovanovikj, A. Nagaraj, E. Yigitbas, A. Anjorin, S. Sauer, G. Engels, in: Proceedings of the 1st IEEE/ACM International Conference on Automation of Software Test AST, 2020


Hypothesis-driven Adaptation of Business Models based on Product Line Engineering

S. Gottschalk, F. Rittmeier, G. Engels, in: Proceedings of the 22nd IEEE International Conference on Business Informatics, IEEE, 2020

The continuous innovation of its business models is an important task for a company to stay competitive. During this process, the company has to validate various hypotheses about its business models by adapting to uncertain and changing customer needs effectively and efficiently. This adaptation, in turn, can be supported by the concept of Software Product Lines (SPLs). SPLs reduce the time to market by deriving products for customers with changing requirements using a common set of features, structured as a feature model. Analogously, we support the process of business model adaptation by applying the engineering process of SPLs to the structure of the Business Model Canvas (BMC). We call this concept a Business Model Decision Line (BMDL). The BMDL matches business domain knowledge in the form of a feature model with customer needs to derive hypotheses about the business model together with experiments for validation. Our approach is effective by providing a comprehensive overview of possible business model adaptations and efficient by reusing experiments for different hypotheses. We implement our approach in a tool and illustrate the usefulness with an example of developing business models for a mobile application.


Model-based Product Configuration in Augmented Reality Applications (to appear)

S. Gottschalk, E. Yigitbas, E. Schmidt, G. Engels, in: Proceedings of the 8th International Working Conference on Human-Centered Software Engineering (HCSE'20), 2020


Model-Driven Mutation Framework for Validation of Test Case Migration (to appear)

I. Jovanovikj, N. Weidmann, E. Yigitbas, A. Anjorin, S. Sauer, G. Engels, in: Proceedings of the International Conference on Systems Modelling and Management ICSMM, 2020


Model-based Hypothesis Engineering for Supporting Adaptation to Uncertain Customer Needs

S. Gottschalk, E. Yigitbas, G. Engels, in: Business Modeling and Software Design, Springer International Publishing, 2020, pp. 276-286

To build successful products, the developers have to adapt their product features and business models to uncertain customer needs. This adaptation is part of the research discipline of Hypotheses Engineering (HE) where customer needs can be seen as hypotheses that need to be tested iteratively by conducting experiments together with the customer. So far, modeling support and associated traceability of this iterative process are missing. Both, in turn, are important to document the adaptation to the customer needs and identify experiments that provide most evidence to the customer needs. To target this issue, we introduce a model-based HE approach with a twofold contribution: First, we develop a modeling language that models hypotheses and experiments as interrelated hierarchies together with a mapping between them. While the hypotheses are labeled with a score level of their current evidence, the experiments are labeled with a score level of maximum evidence that can be achieved during conduction. Second, we provide an iterative process to determine experiments that offer the most evidence improvement to the modeled hypotheses. We illustrate the usefulness of the approach with an example of testing the business model of a mobile application.


2019

Intertwined Development of Business Model and Product Functions for Mobile Applications: A Twin Peak Feature Modeling Approach

S. Gottschalk, F. Rittmeier, G. Engels, in: Software Business, Springer International Publishing, 2019, pp. 192-207

Mobile app stores like Apple's AppStore or Google's PlayStore are highly competitive markets for third-party developers wanting to develop successful applications. During the development process, many developers focus on the multitude of product functions but neglect the business model as an equally important part. As a result, developers often fail to meet customer needs, leading to unnecessary development costs and poor market penetration. This, in turn, raises the question of how we intertwine the business model and product functions during the development process to ensure a better alignment between the two. In this paper, we show this intertwined development by adapting the concept of Twin Peaks to the business model and product functions. Based on feature modeling as an abstraction layer, we introduce the concept of a Business Model Decision Line (BMDL) to structure the business model decisions and their relation to product functions structured in a Software Product Line (SPL). The basis of our feature models is the analysis of top listed applications in the app stores of Apple and Google. To create and modify both models, we provide an incremental feature structuring and iterative feature selection process. This combination of abstraction layer and development process supports third-party developers to build successful applications both from a business and a product perspective.


From Pattern Invocation Networks to Rule Preconditions

N. Weidmann, A. Anjorin, F. Stolte, F. Kraus, in: Graph Transformation - 12th International Conference, ICGT 2019, Held as Part of STAF 2019, Eindhoven, The Netherlands, July 15-16, 2019, Proceedings, 2019, pp. 195-211


ABIS 2019 – 23rd International Workshop on Personalization and Recommendation on the Web and Beyond

M. Augstein, E. Herder, W. Wörndl, E. Yigitbas, in: 30th ACM Conference on Hypertext and Social Media (HT ’19), September 17–20, 2019, Hof, Germany, ACM, 2019


A Digital Twin-Based Multi-Modal UI Adaptation Framework for Assistance Systems in Industry 4.0

K. Josifovska, E. Yigitbas, G. Engels, in: Proceedings of the 21st International Conference on Human-Computer Interaction (HCII 2019), Springer, LNCS, 2019, pp. 398-409


Detection and Resolution of Data-Flow Differences in Business Process Models

I. Jovanovikj, E. Yigitbas, C. Gerth, S. Sauer, G. Engels, in: Information Systems Engineering in Responsible Information Systems - CAiSE Forum 2019, Rome, Italy, June 3-7, 2019, Proceedings, 2019, pp. 145-157


Incremental (Unidirectional) Model Transformation with eMoflon::IBeX

N. Weidmann, A. Anjorin, P. Robrecht, G. Varró, in: Graph Transformation - 12th International Conference, ICGT 2019, Held as Part of STAF 2019, Eindhoven, The Netherlands, July 15-16, 2019, Proceedings, 2019, pp. 131-140


Partizipation von Beschäftigten in der Gestaltung einer digitalisierten Arbeitswelt 4.0 mittels einer Canvas-Methode

H.G. Fischer, F. Rittmeier, T.F. Strothmann, N. Schwenniger, in: Arbeit 4.0 im Mittelstand, Springer Gabler, 2019

Sinnvolle und gebrauchstaugliche digitale Assistenzsysteme, die Beschäftigte bei ihren alltäglichen Aufgaben unterstützen, stellen eine Herausforderung für viele Organisationen hinsichtlich der individuellen und organisationalen Akzeptanz einschließlich der Gebrauchstauglichkeit (Usability), dem Benutzererlebnis (User Experience, UX) und „Arbeit 4.0“-Aspekten dar. Vorhandene Methoden des Software Engineering sind nicht geeignet, Beschäftigte angemessen in die Gestaltung und Entwicklung zu integrieren und Lösungskonzepte solcher Systeme auf Augenhöhe zu betrachten. In diesem Beitrag wird eine leichtgewichtige Canvas-Methode vorgestellt, die sich mit diesen Herausforderungen befasst. Sie umfasst die menschliche, die geschäftliche sowie die technologische Perspektive in einem gemeinsamen Kommunikationsinstrument, dem „Digital Assistance System Canvas“. Erste Evaluationen zeigen, dass die Teilnehmenden das Canvas-Konzept schätzen und die Methode vielseitig in verschiedenen Szenarien einsetzbar ist. Vielfältige Fragen in den Canvas-Bausteinen bereichern die gemeinsame Diskussion über neue Systeme und die Verbesserung bzw. Sicherstellung der Akzeptanz sowie die Denkweise in frühen Phasen des Design- und Entwicklungsprozesses.


    Förderung von Kreativität in studentischen Kleingruppenprojekten in der Informatik – Ein Prototyping-basierter Ansatz

    T.F. Strothmann, die hochschullehre (2019)

    Dieser Artikel erörtert, ob in studentischen Kleingruppenprojekten in der Informatik Kreativität und die Erarbeitung kreativer Ideen explizit gefördert werden kann. Dazu wird ein Seminarkonzept detailliert vorgestellt, welches auf zwei Grundkonzepten der Informatikpraxis beruht: agiles Projektvorgehen und Prototyping. Die Teilnehmenden des Seminars wurden gezielt in einen Kreativitätsprozess geleitet, indem sie für gegebene moderne Technologien (Virtual Reality, Augmented Reality, Drohnen, etc.) neuartige Nutzungsszenarien entwickeln sollten. Um zu evaluieren, ob das Lehrkonzept erfolgreich ist, wird sowohl die produktbezogene als auch die prozessbezogene Kreativität betrachtet. Für die produktbezogene Kreativität werden die von den Teilnehmenden erstellten Projektideen inklusive der benutzten Prototypingtechnik vorgestellt und bewertet. Die Teilnehmenden haben nicht nur eine enorme Breite an Ideen entwickelt (in der Summe ca. 40 bei 16 Teilnehmenden), sondern insbesondere auch acht Ideen im Verlaufe des Seminars sehr konkret weiterentwickelt. Hinsichtlich der prozessbezogenen Kreativität wird das Lehrkonzept durch mehrere Fragebögen eruiert. Die Studierenden sind mit dem Seminar, der Herangehensweise und den Ergebnissen sehr zufrieden, was unter anderem durch die äußerst positive studentische Veranstaltungskritik (u.a. 1,0 für den Gesamteindruck sowie Atmosphäre in der Veranstaltung) und die Auswertung der Evaluationsfragebögen unterstrichen wird. Auch von externen Beobachtern werden die erarbeiteten Ergebnisse und der Einsatz von Prototyping als sehr positiv bewertet.


      Specifying Web Interfaces for Command-line Applications Based on OpenAPI

      D. Wolters, J. Kirchhoff, G. Engels, in: Service-Oriented Computing – ICSOC 2019 Workshops, Springer, 2019, pp. 30-41


      Incremental Bidirectional Model Transformation with eMoflon::IBeX

      N. Weidmann, A. Anjorin, L. Fritsche, G. Varró, A. Schürr, E. Leblebici, in: Proceedings of the 8th International Workshop on Bidirectional Transformations co-located with the Philadelphia Logic Week, Bx@PLW 2019, Philadelphia, PA, USA, June 4, 2019., 2019, pp. 45-55


      A Model-based Framework for Context-aware Augmented Reality Applications

      E. Yigitbas, I. Jovanovikj, S. Sauer, G. Engels, in: Handling Security, Usability, User Experience and Reliability in User-Centered Development Processes (IFIP WG 13.2 & WG 13.5 International Workshop @ INTERACT2019), 2019


      A feature-based classification of triple graph grammar variants

      N. Weidmann, R. Oppermann, P. Robrecht, in: Proceedings of the 12th ACM SIGPLAN International Conference on Software Language Engineering - SLE 2019, 2019


      Verteiltes Warenwirtschaftssystem [Distributed Warehouse System]

      T. Göllner, J. Schwarz, S. Gottschalk, S. Sauer. Verteiltes Warenwirtschaftssystem [Distributed Warehouse System], Patent DE 10 2018 206 390. 2019.

      Beschrieben ist ein verteiltes Warenwirtschaftssystem, bei dem der Kunde, Händler, und der Hersteller vernetzt sind. Dies wird bewerkstelligt durch einen Cloud-Speicher (105), der Cloud-Speicher (105) aufweisend ein Mittel zum Speichern (105a) von Daten, ein Mittel zum Empfangen von ersten Daten von einem ersten Netzwerkteilnehmer (110), wobei die ersten Daten zugehörig sind zu einem physischen Objekt, ein Mittel zum Empfangen von Anfragedaten von einem zweiten Netzwerkteilnehmer (120), ein Mittel zum Empfangen von zweiten Daten von einem dritten Netzwerkteilnehmer (130), wobei die zweiten Daten zugehörig sind zu den ersten Daten und zumindest ein Datum aufweisen, welches angepasst ist, die ersten Daten zu ändern in Abhängigkeit der empfangenen Anfragedaten, ein Mittel zum Ändern der ersten Daten basierend zumindest im Teil auf den zweiten Daten und den Anfragedaten und ein Mittel zum Senden eines geänderten Teils der ersten Daten von dem Cloud-Speicher (105) an den ersten Netzwerkteilnehmer (110).



        Modular Construction of Context-Specific Test Case Migration Methods

        I. Jovanovikj, E. Yigitbas, M. Grieger, S. Sauer, G. Engels, in: Proceedings of the 7th International Conference on Model-Driven Engineering and Software Development - Volume 1: MODELSWARD,, SciTePress, 2019, pp. 536-543


        Consistent Runtime Adaptation of User Interfaces

        A. Anjorin, E. Yigitbas, H. Kaindl, in: Proceedings of the 8th International Workshop on Bidirectional Transformations (Bx 2019), CEUR-WS.org, 2019, pp. 61-65


        Towards Model-based Development of Context-aware Augmented Reality Applications

        E. Yigitbas, I. Jovanovikj, S. Sauer, G. Engels, Softwaretechnik-Trends, Proceedings of the 21st Workshop Software-Reengineering & Evolution (WSRE) & 10th Workshop Design for Future (DFF) (2019), 39(2), pp. 39-40


        WindCORES - Digital Transformation with Renewable Energy

        E. Yigitbas, G. Schomaker, International Tube Association (ITAtube) Journal (2019)


        Business Models of Store-Oriented Software Ecosystems: A Variability Modeling Approach

        S. Gottschalk, F. Rittmeier, G. Engels, in: Business Modeling and Software Design, Springer International Publishing, 2019, pp. 153-169

        In the last years, store-oriented software ecosystems are gaining more and more attention from a business perspective. In these ecosystems, third-party developers upload extensions to a store which can be downloaded by end users. While the functional scope of such ecosystems is relatively similar, the underlying business models differ greatly in and between their different product domains (e.g. Mobile Phone, Smart TV). This variability, in turn, makes it challenging for store providers to find a business model that fits their own needs. To handle this variability, we introduce the Business Variability Model (BVM) for modeling business model decisions. The basis of these decisions is the analysis of 60 store-oriented software ecosystems in eight different product domains. We map their business model decisions to the Business Model Canvas, condense them to a variability model and discuss particular variants and their dependencies. Our work provides store providers a new approach for modeling business model decisions together with insights of existing business models. This, in turn, supports them in creating new and improving existing business models.


        On-the-fly Usability Evaluation of Mobile Adaptive UIs through Instant User Feedback

        E. Yigitbas, I. Jovanovikj, K. Josifovska, S. Sauer, G. Engels, in: Proceedings of the 17th IFIP TC.13 International Conference on Human-Computer Interaction (INTERACT 2019), Springer, LNCS, 2019, pp. 563-567


        Special issue: Selected papers of BPM 2017

        J. Carmona, G. Engels, A. Kumar, M. Reichert, Information Systems (2019), pp. 238-239


        Vandalism Detection in Crowdsourced Knowledge Bases

        S. Heindorf, Universität Paderborn, 2019


        A Value-Centered Approach for Unique and Novel Software Applications

        B. Senft, F. Rittmeier, H.G. Fischer, S. Oberthür, in: Design, User Experience, and Usability. Practice and Case Studies, 2019


        Consistency management via a combination of triple graph grammars and linear programming

        N. Weidmann, A. Anjorin, E. Leblebici, A. Schürr, in: Proceedings of the 12th ACM SIGPLAN International Conference on Software Language Engineering - SLE 2019, 2019



        MultiSkipGraph: A Self-stabilizing Overlay Network that Maintains Monotonic Searchability

        L. Luo, C. Scheideler, T.F. Strothmann, in: Proceedings of the 2019 IEEE 33rd International Parallel and Distributed Processing Symposium (IPDPS '19), 2019

        Self-stabilizing overlay networks have the advantage of being able to recover from illegal states and faults. However, the majority of these networks cannot give any guarantees on their functionality while the recovery process is going on. We are especially interested in searchability, i.e., the functionality that search messages for a specific node are answered successfully if a node exists in the network. In this paper we investigate overlay networks that ensure the maintenance of monotonic searchability while the self-stabilization is going on. More precisely, once a search message from node u to another node v is successfully delivered, all future search messages from u to v succeed as well. We extend the existing research by focusing on skip graphs and present a solution for two scenarios: (i) the goal topology is a super graph of the perfect skip graph and (ii) the goal topology is exactly the perfect skip graph.


          Context- and Data-driven Satisfaction Analysis of User Interface Adaptations Based on Instant User Feedback

          E. Yigitbas, A.. Hottung, S. Mansfield Rojas, A. Anjorin, S. Sauer, G. Engels, Proceedings of the ACM on Human-Computer Interaction (2019), 3, pp. 19:1-19:20


          Component-Based Development of Adaptive User Interfaces

          E. Yigitbas, K. Josifovska, I. Jovanovikj, F.. Kalinci, A. Anjorin, G. Engels, in: Proceedings of the 11th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2019), 2019, pp. 13:1--13:7


          2019 ACM/IEEE 22nd International Conference on Model Driven Engineering Languages and Systems Companion (MODELS-C)

          G. Engels, L. Burgueno, A. Pretschner, S. Voss, M. Chaudron, J. Kienzle, M. Völter, S. Gérard, M. Zahedi, E. Bousse, A. Rensink, F. Polack, G. Kappel, 2019


          A Context-aware Virtual Reality First Aid Training Application

          E. Yigitbas, J. Heindörfer, G. Engels, in: Proceedings of the Mensch und Computer 2019 (MuC ’19), ACM, 2019, pp. 885--888


          Projektmanagement und Vorgehensmodelle 2019. Neue Vorgehensmodelle in Projekten – Führung, Kulturen und Infrastrukturen im Wandel.

          O. Linssen, M. Mikusz, A. Volland, E. Yigitbas, M. Engstler, M. Fazal-Baqaie, M. Kuhrmann. Projektmanagement und Vorgehensmodelle 2019. Neue Vorgehensmodelle in Projekten – Führung, Kulturen und Infrastrukturen im Wandel.. 2019.



          Process Weakness Patterns for the Identification of Digitalization Potentials in Business Processes

          F. Rittmeier, G. Engels, A. Teetz, in: Business Process Management Workshops, Springer International Publishing, 2019, pp. 531-542


          Reference Framework for Digital Twins within Cyber-Physical Systems

          K. Josifovska, E. Yigitbas, G. Engels, in: Proceedings of 5th International Workshop on Software Engineering for Smart Cyber-Physical Systems (SEsCPS'19), IEEE Press, 2019, pp. 25-31


          Values in Computing (Dagstuhl Seminar 19291)

          G. Engels, C. Becker, A. Feenberg, M.A. Ferrario, G. Fitzpatrick, Dagstuhl Reports 9(7) (2019)


          2018

          On the development of consistent user interfaces (extended abstract)

          A. Anjorin, E. Yigitbas, H. Kaindl, R. Popp, in: Conference Companion of the 2nd International Conference on Art, Science, and Engineering of Programming, Nice, France, April 09-12, 2018, 2018, pp. 18-20


          Who Guards the Guards? On the Validation of Test Case Migration

          I. Jovanovikj, E. Yigitbas, A. Anjorin, S. Sauer, Softwaretechnik-Trends, Proceedings of the 20th Workshop Software-Reengineering & Evolution (WSRE) & 9th Workshop Design for Future (DFF) (2018)


          Forming Tile Shapes with Simple Robots

          R. Gmyr, K. Hinnenthal, I. Kostitsyna, F. Kuhn, D. Rudolph, C. Scheideler, T.F. Strothmann, in: Proceedings of the 24th International Conference on DNA Computing and Molecular Programming, Springer International Publishing, 2018, pp. 122-138


          Real-time Graph-Based 3D Reconstruction of Sparse Feature Environments for Mobile Robot Applications

          D. Gaspers, C. Knorr, T. Nickchen, D. Nickchen, B. Mertsching, M.A. Mohamed, in: 2018 IEEE International Symposium on Safety, Security, and Rescue Robotics (SSRR), IEEE, 2018


          Usability Evaluation of Model-Driven Cross-Device Web User Interfaces

          E. Yigitbas, A. Anjorin, I. Jovanovikj, T. Kern, S. Sauer, G. Engels, in: Proceedings of the 7th International Working Conference on Human-Centered Software Engineering (HCSE'18), Springer, LNCS , 2018, pp. 231-247


          Einsatz von Classroom-Response-Systemen und Peer Instruction in der Veranstaltung Grundlagen von Datenbanken

          D. Wolters, die hochschullehre (2018)(4)


          Poster: CrossEcore: An Extendible Framework to Use Ecore and OCL across Platforms

          S. Schwichtenberg, I. Jovanovikj, C. Gerth, G. Engels, in: Proceedings of the 40th International Conference on Software Engineering, ICSE 2018 - Companion Volume, 2018

          Today, model-driven approaches are a cornerstone in modern software development. The Eclipse Modeling Framework (EMF) is highly adopted in practice and generates Java code from platform-independent models with embedded Object Constraint Language (OCL) expressions. However, applications that target multiple platforms like Android, iOS, Windows, web browsers usually need to be implemented in different programming languages. Feature-complete Ecore and OCL runtime APIs are not available for all these platforms, such that their functionality has to be re-implemented. In this paper, we present CrossEcore: A multi-platform enabled modeling framework that generates C#, Swift, TypeScript, and JavaScript code from Ecore models with embedded OCL. An OCL compiler translates OCL expressions into expressions of the target language. The Ecore and OCL API can be consistently used across platforms, which facilitates application portability. CrossEcore is also extendible and can be easily adopted for new programming languages.


            Design Options of Store-Oriented Software Ecosystems: An Investigation of Business Decisions

            B. Jazayeri, O. Zimmermann, G. Engels, J. Küster, D. Kundisch, D. Szopinski, in: Proceeding of International Symposium on Business Modeling and Software Design, Springer, 2018, pp. 390-400

            Nowadays companies like Apple create ecosystems of third- party providers and users around their software platforms. Often online stores like Apple App Store are created to directly market third-party solutions. We call such ecosystems store-oriented software ecosystems. While the architecture of these ecosystems is mainly derived from busi- ness decisions of their owners, ecosystems with greatly different archi- tectural designs have been created. This diversity makes it challenging for future ecosystem providers to understand which architectural design is suitable to fulfill certain business decisions. In turn, opening a plat- form becomes risky while endangering intellectual property or scarifying quality of services. In this paper, we identify three main design options of store-oriented software ecosystems by classifying existing ecosystems based on similarities in their business decisions. We elaborate on the design options, discuss their main contributions, and provide exemplary ecosystems. Our work provides aspiring ecosystem providers with the reusable knowledge of existing ecosystems and helps them to take more informed architectural decisions and reduce risks in future.


              Model-based UI Modernization: From Legacy UIs to Self-adaptive UIs

              I. Jovanovikj, E. Yigitbas, S. Sauer, Softwaretechnik-Trends, Proceedings of the 20th Workshop Software-Reengineering & Evolution (WSRE) & 9th Workshop Design for Future (DFF) (2018)


              Adapt Cases 4 BPM - A Modeling Framework for Process Flexibility in IIoT

              G. Engels, T.F. Strothmann, A. Teetz, in: 2018 IEEE 22nd International Enterprise Distributed Object Computing Workshop (EDOCW), IEEE, 2018


              Tolerant consistency management in model-driven engineering

              N. Weidmann, in: Proceedings of the 21st ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion Proceedings - MODELS '18, ACM Press, 2018


              Model-Driven Test Case Migration: The Test Case Reengineering Horseshoe Model

              I. Jovanovikj, G. Engels, A. Anjorin, S. Sauer, in: Information Systems in the Big Data Era - CAiSE Forum 2018, Tallinn, Estonia, June 11-15, 2018, ProceedingIs, Springer International Publishing, 2018, pp. 133-147

              Existing test cases represent important assets, which are worth reusing in software migration projects. The benefit is twofold, reuse of relevant information as well cost saving by avoiding design of new test cases. As test cases are implemented in the same or a compatible technology as the system they are testing, they have to somehow follow the system migration, i.e., they should be co-migrated. Due to the size of the test case set, and often missing conformity in the structure of the test cases, migration of test cases is a quite challenging task. As model-driven engineering has been established to manage those complex tasks, we apply it in the test case domain. In this paper, we propose a generic migration method based on model-driven reengineering techniques. Our method which involves reverse engineering, restructuring, and forward engineering is applied in an industrial case study where appropriate tooling was developed as well.


                IoT-ASAP 2018: Message from the Chairs

                R. Spalazzese, M.C. Platenius, S. Becker, G. Engels, in: 2018 IEEE International Conference on Software Architecture Companion (ICSA-C), 2018


                Self-Stabilizing Supervised Publish-Subscribe Systems

                M. Feldmann, C. Kolb, C. Scheideler, T.F. Strothmann, in: Proceedings of the 32nd IEEE International Parallel & Distributed Processing Symposium (IPDPS), IEEE, 2018

                In this paper we present two major results: First, we introduce the first self-stabilizing version of a supervised overlay network (as introduced in~\cite{DBLP:conf/ispan/KothapalliS05}) by presenting a self-stabilizing supervised skip ring. Secondly, we show how to use the self-stabilizing supervised skip ring to construct an efficient self-stabilizing publish-subscribe system. That is, in addition to stabilizing the overlay network, every subscriber of a topic will eventually know all of the publications that have been issued so far for that topic. The communication work needed to processes a subscribe or unsubscribe operation is just a constant in a legitimate state, and the communication work of checking whether the system is still in a legitimate state is just a constant on expectation for the supervisor as well as any process in the system.


                  Digitalisierungspotenziale in Geschäftsprozessen effizient und effektiv erkennen (Effective and Efficient Identification of Digitalization Potentials in Business Processes)

                  F. Rittmeier, G. Engels, A. Teetz, in: Joint Proceedings of the Workshops at Modellierung 2018 co-located with Modellierung 2018, Braunschweig, Germany, February 21, 2018., CEUR-WS.org, 2018, pp. 215--221

                  Ein wichtiges Element der Digitalen Transformation ist die Digitalisierung der Prozesse in Unternehmen. Eine Herausforderung besteht hierbei in der systematischen Erkennung von Digitalisierungspotenzialen in Prozessen. Bestehende Ansätze benötigen Experten, welche Potenziale über ihre Erfahrung oder zeitaufwendig mithilfe von Musterkatalogen identifizieren. In diesem Artikel werden verschiedene Digitalisierungspotenziale klassifiziert und Muster für ein zukünftiges musterbasiertes Analyseverfahren zur automatisierten Identifikation von Digitalisierungspotenzialen in BPMN-Diagrammen beschrieben. Im Vergleich zu bestehenden Ansätzen erlaubt es Experten die Identifizierung von Digitalisierungspotenzialen effizienter und effektiver durchzuführen.


                  Forschendes Lernen in der Informatik - In praxisnaher Projektgruppe einen Softwareentwicklungsprozess erforschen

                  B. Senft, S. Oberthür, H.G. Fischer, in: Schriften zur allgemeinen Hochschuldidaktik - Band 3. Tagungsband Forschendes Lernen - The wider view, 2018


                  Semantic Data Mediator: Linking Services to Websites

                  D. Wolters, S. Heindorf, J. Kirchhoff, G. Engels, in: Service-Oriented Computing -- ICSOC 2017 Workshops, Springer International Publishing, 2018, pp. 388-392

                  Many websites offer links to social media sites for convenient content sharing. Unfortunately, those sharing capabilities are quite restricted and it is seldom possible to share content with other services, like those provided by a user's favorite applications or smart devices. In this paper, we present Semantic Data Mediator (SDM) --- a flexible middleware linking a vast number of services to millions of websites. Based on reusable repositories of service descriptions defined by the crowd, users can easily fill a personal registry with their favorite services, which can then be linked to websites by SDM. For this, SDM leverages semantic data, which is already available on millions of websites due to search engine optimization. Further support for our approach from website or service developers is not required. To enable the use of a broad range of services, data conversion services are automatically composed by SDM to transform data according to the needs of the different services. In addition to linking web services, various service adapters allow services of applications and smart devices to be linked as well. We have fully implemented our approach and present a real-world case study demonstrating its feasibility and usefulness.


                    Description Languages for Consistency Management Scenarios Based on Examples from the Industry Automation Domain

                    A. Anjorin, E. Yigitbas, E. Leblebici, A. Schürr, M. Lauder, M. Witte, Programming Journal (2018), 2(3), pp. 7


                    2018 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC)

                    J. Cunha, J.P. Fernandes, C. Kelleher, J. Mendes, G. Engels, in: Proceedings of 2018 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC), Lisbon, Portugal, October 1-4, 2018, IEEE, 2018


                    Gerechtigkeit in flexiblen Arbeits- und Managementprozessen

                    G. Engels, G.W. Maier, S.K. Ötting, E. Steffen, A. Teetz, in: Zukunft der Arbeit – Eine praxisnahe Betrachtung, Springer Verlag, 2018, pp. 221-231


                    On the runtime of universal coating for programmable matter

                    J. J. Daymude, Z. Derakhshandeh, R. Gmyr, A. Porter, A. W. Richa, C. Scheideler, T.F. Strothmann, Natural Computing (2018)(1), pp. 81--96


                    Test Case Migration: A Reference Process Model and its Instantiation in an Industrial Context

                    I. Jovanovikj, E. Yigitbas, S. Sauer, Joint Proceedings of the Workshops at Modellierung 2018 co-located with Modellierung 2018, Braunschweig, Germany, February 21, 2018. (2018), pp. 153-162


                    Assist Users to Straightaway Suggest and Describe Experienced Problems

                    B. Senft, H.G. Fischer, S. Oberthür, N. Patkar, in: Design, User Experience, and Usability: Theory and Practice, Springer International Publishing, 2018, pp. 758-770


                    Model-integrating development of software systems: a flexible component-based approach

                    M. Derakhshanmanesh, J. Ebert, M. Grieger, G. Engels, Software & Systems Modeling (2018), pp. 1-30


                    Bidirectional Method Patterns for Language Editor Migration

                    E. Yigitbas, A. Anjorin, E. Leblebici, M. Grieger, in: Modelling Foundations and Applications - 14th European Conference, {ECMFA} 2018, Held as Part of {STAF} 2018, Toulouse, France, June 26-28, 2018, Proceedings, 2018, pp. 97-114


                    Patterns of Store-oriented Software Ecosystems: Detection, Classification, and Analysis of Design Options

                    B. Jazayeri, O. Zimmermann, J. Küster, G. Engels, D. Kundisch, D. Szopinski, in: The Latin American Conference on Pattern Languages of Programs (SLPLoP), ACM. To appear, 2018

                    Software companies nowadays create ecosystems of users and third-party providers around their platforms. They often provide online stores so that the third-party developments can be exposed to users directly. The resulting ecosystems differ significantly from each other in their architectural designs because their providers differ in terms of business goals and contexts. Until now, this architectural diversity and rationale behind it are not well-understood. Therefore, it is not clear which software features contribute to ecosystem’s success with respect to certain business goals and context. This hinders systematic creation of ecosystems in the future. Thus, decision-making becomes too risky; for future ecosystem providers, which may lead to creation of inefficient ecosystems that lack critical features, and for third-party providers to rely on ad-hoc choices while deciding on suitability of an ecosystem for their future career. In this paper, we introduce three design patterns for store- oriented software ecosystems by classifying the design decisions, business goals, and context of 111 store-oriented software ecosystems. Each design pattern provides an architectural solution to achieve a different business goal while supporting a different context. We discuss how the design patterns are applied together in order to achieve more business goals. Our work supports ecosystem and third-party providers by sharing practice-proven architectural solutions, helping them to take informed architectural decisions and reduce technical risks.


                      A Canvas Method to Foster Interdisciplinary Discussions on Digital Assistance Systems

                      H.G. Fischer, B. Senft, F. Rittmeier, S. Sauer, in: Design, User Experience, and Usability: Theory and Practice. Proceedings of the 20th International Conference on Human-Computer Interaktion (HCI International 2018), Springer International Publishing, 2018, pp. 711-724


                      Context-specific Quality Evaluation of Test Cases

                      I. Jovanovikj, V. Narasimhan, G. Engels, S. Sauer, in: Proceedings of the 6th International Conference on Model-Driven Engineering and Software Development - Volume 1: MODELSWARD,, SciTePress, 2018, pp. 594-601



                      2017

                      A Variability Model for Store-oriented Software Ecosystems: An Enterprise Perspective

                      B. Jazayeri, O. Zimmermann, G. Engels, D. Kundisch, in: Proceedings of the 15th International Conference on Service Oriented Computing (ICSOC), Springer, 2017

                      Pioneers of today’s software industry like Salesforce and Apple have established successful ecosystems around their software platforms. Architectural knowledge of the existing ecosystems is implicit and fragmented among online documentation. In protection of intellectual property, existing documentation hardly reveals influential business strategies that affect the ecosystem structure. Thus, other platform providers can hardly learn from the existing ecosystems in order to systematically make reasonable design decisions with respect to their business strategies to create their own ecosystems. In this paper, we identify a variability model for architectural design decisions of a store-oriented software ecosystem product line from an enterprise perspective, comprising business, application, and infrastructure views. We derive the variability model from fragmentary material of existing ecosystems and a rigorous literature review using a research method based on the design science paradigm. To show its validity, we describe real-world ecosystems from diverse domains using the variability model. This knowledge helps platform providers to develop customized ecosystems or to recreate existing designs in a systematic way. This, in turn, contributes to an increase in designer and developer productivity.


                        Adapt-UI: an IDE supporting model-driven development of self-adaptive UIs

                        E. Yigitbas, S. Sauer, G. Engels, in: Proceedings of the {ACM} {SIGCHI} Symposium on Engineering Interactive Computing Systems, {EICS} 2017, Lisbon, Portugal, June 26-29, 2017, 2017, pp. 99-104


                        A Human-Centered Perspective on Software Quality: Acceptance Criteria for Work 4.0

                        H.G. Fischer, M. Engler, S. Sauer, in: Design, User Experience, and Usability: Theory, Methodology, and Management, Springer International Publishing, 2017, pp. 570-583


                        On-The-Fly Computing Meets IoT Markets - Towards a Reference Architecture

                        B. Jazayeri, S. Schwichtenberg, in: Proceedings of the International Conference on Software Architecture (ICSA) IoT-ASAP Workshop, IEEE, 2017, pp. 120--127

                        The Internet of Things (IoT) connects the things of our everyday life and supports usin our common activities.Several markets for IoT services have been created. These markets enable IoT users to search and compose services in order to support an IoT activity.However, existing IoT markets like IFTTT (If This Then That) are not convenient for users with respect to service discovery and composition.The objective of On-the-fly (OTF) computing is to configure and provide software markets that fulfill individual users' wishes by the automatic on-the-fly composition of single services.The architecture framework of On-the-fly computing markets helps architects to systematically develop these systems in different domains.In this paper, we use our OTF architectural framework to examine the requirements of a reference architecture for IoT markets.Furthermore, we perform a comparison between the architecture of IFTTT as an existing IoT market with this reference architecture. The results show how existing IoT markets can be improved. In return, the practical knowledge of IFTTT is taken to the reference architecture.This knowledge helps to overcome the limitations of today's IoT markets or creating new markets in the future.


                          Concept-Based Engineering of Situation-Specific Migration Methods

                          M. Grieger, M. Fazal-Baqaie, G. Engels, M. Klenke, in: Software Engineering 2017, 2017, pp. 65-66


                          Systematic spreadsheet construction processes

                          J. Mendes, J. Cunha, F. Duarte, G. Engels, J. Saraiva, S. Sauer, in: Proceedings of the 39th International Conference on Software Engineering, {ICSE} 2017, Buenos Aires, Argentina, May 20-28, 2017 - Companion Volume, IEEE, 2017, pp. 123-127


                          From User Demand to Software Service: Using Machine Learning to Automate the Requirements Specification Process

                          L. van Rooijen, F.S. Bäumer, M.C. Platenius, M. Geierhos, H. Hamann, G. Engels, in: 2017 IEEE 25th International Requirements Engineering Conference Workshops (REW), IEEE, 2017, pp. 379-385

                          Bridging the gap between informal, imprecise, and vague user requirements descriptions and precise formalized specifications is the main task of requirements engineering. Techniques such as interviews or story telling are used when requirements engineers try to identify a user's needs. The requirements specification process is typically done in a dialogue between users, domain experts, and requirements engineers. In our research, we aim at automating the specification of requirements. The idea is to distinguish between untrained users and trained users, and to exploit domain knowledge learned from previous runs of our system. We let untrained users provide unstructured natural language descriptions, while we allow trained users to provide examples of behavioral descriptions. In both cases, our goal is to synthesize formal requirements models similar to statecharts. From requirements specification processes with trained users, behavioral ontologies are learned which are later used to support the requirements specification process for untrained users. Our research method is original in combining natural language processing and search-based techniques for the synthesis of requirements specifications. Our work is embedded in a larger project that aims at automating the whole software development and deployment process in envisioned future software service markets.


                            Active Coevolutionary Learning of Requirements Specifications from Examples

                            M.D. Wever, L. van Rooijen, H. Hamann, in: Proceedings of the Genetic and Evolutionary Computation Conference (GECCO), 2017, pp. 1327--1334

                            Within software engineering, requirements engineering starts from imprecise and vague user requirements descriptions and infers precise, formalized specifications. Techniques, such as interviewing by requirements engineers, are typically applied to identify the user’s needs. We want to partially automate even this first step of requirements elicitation by methods of evolutionary computation. The idea is to enable users to specify their desired software by listing examples of behavioral descriptions. Users initially specify two lists of operation sequences, one with desired behaviors and one with forbidden behaviors. Then, we search for the appropriate formal software specification in the form of a deterministic finite automaton. We solve this problem known as grammatical inference with an active coevolutionary approach following Bongard and Lipson [2]. The coevolutionary process alternates between two phases: (A) additional training data is actively proposed by an evolutionary process and the user is interactively asked to label it; (B) appropriate automata are then evolved to solve this extended grammatical inference problem. Our approach leverages multi-objective evolution in both phases and outperforms the state-of-the-art technique [2] for input alphabet sizes of three and more, which are relevant to our problem domain of requirements specification.


                              On the Necessity of an Architecture Framework for On-The-Fly Computing

                              B. Jazayeri, S. Schwichtenberg, in: Proceedings of Softwaretechnik-Trends Workshops, Gesellschaft für Informatik eV, Fachgruppe PARS, 2017


                              Model-Driven Context Management for Self-adaptive User Interfaces

                              E. Yigitbas, S. Grün, S. Sauer, G. Engels, in: Ubiquitous Computing and Ambient Intelligence - 11th International Conference, UCAmI 2017, Philadelphia, PA, USA, November 7-10, 2017, Proceedings, 2017, pp. 624-635


                              XDAI-A: Framework for Enabling Cross-Device Integration of Android Apps

                              D. Wolters, J. Kirchhoff, C. Gerth, G. Engels, in: Service-Oriented Computing -- ICSOC 2016 Workshops, Springer International Publishing, 2017, pp. 203-206

                              A lot of people are managing multiple computing devices suited for different purposes, like private and work devices. Integrating applications running on different devices is often a problem, because the services provided by those applications are not meant to be integrated. In this demonstration, we present our XDAI-A framework which enables cross-device integration of services provided by Android apps. The framework uses adapters to convert Android-internal service interfaces of existing apps into external services with a platform-independent interface that can be accessed from applications on other devices and even other platforms. Our ready-to-use framework does not require to alter existing Android apps, since the adapters are installed separately. For the convenient specification of adapters, our framework comes with a domain-specific language (DSL). Additionally, we provide an infrastructure to find and integrate devices and their applications' services.


                                Akzeptierte Assistenzsysteme in der Arbeitswelt 4.0 durch systematisches Human-Centered Software Engineering

                                H.G. Fischer, B. Senft, K. Stahl, in: Wissenschafts- und Industrieforum 2017 - Intelligente Technische Systeme, Verlagsschriftenreihe des Heinz Nixdorf Instituts, 2017, pp. 197-210


                                A Characterization for Decidable Separability by Piecewise Testable Languages

                                W. Czerwinski, W. Martens, L. van Rooijen, M. Zeitoun, G. Zetzsche, Discrete Mathematics & Theoretical Computer Science (2017), 19(4)


                                Visual Requirements Modeling for Cross-Device Systems

                                D. Wolters, C. Gerth, G. Engels, Computer Science and Information Systems (ComSIS) (2017), 14(2), pp. 517-536


                                Mensch und Computer 2017 - Usability Professionals. Tagungsband

                                S.. Hess, H.G. Fischer, Gesellschaft für Informatik e.V. und German UPA e.V., 2017


                                Linking Services to Websites by Leveraging Semantic Data

                                D. Wolters, S. Heindorf, J. Kirchhoff, G. Engels, in: 2017 IEEE International Conference on Web Services (ICWS), IEEE, 2017

                                Websites increasingly embed semantic data for search engine optimization. The most common ontology for semantic data, schema.org, is supported by all major search engines and describes over 500 data types, including calendar events, recipes, products, and TV shows. As of today, users wishing to pass this data to their favorite applications, e.g., their calendars, cookbooks, price comparison applications or even smart devices such as TV receivers, rely on cumbersome and error-prone workarounds such as reentering the data or a series of copy and paste operations. In this paper, we present Semantic Data Mediator (SDM), an approach that allows the easy transfer of semantic data to a multitude of services, ranging from web services to applications installed on different devices. SDM extracts semantic data from the currently displayed web page on the client-side, offers suitable services to the user, and by the press of a button, forwards this data to the desired service while doing all the necessary data conversion and service interface adaptation in between. To realize this, we built a reusable repository of service descriptions, data converters, and service adapters, which can be extended by the crowd. Our approach for linking services to websites relies solely on semantic data and does not require any additional support by either website or service developers. We have fully implemented our approach and present a real-world case study demonstrating its feasibility and usefulness.



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