Invited Talk of Prof. Engels with the title "On-the-Fly Computing: Dynamic Composition of Software Services" at GRK Workshop 2012, common workshop of German Research Training Groups in Computer Science at Schloß Dagstuhl on June 18, 2012 <link http: dagstuhl2012.soamed.de _self external-link-new-window external link in new>(http://dagstuhl2012.soamed.de/)