%0 Conference Paper %1 ls_leimeister %A Bitzer, Philipp %A Söllner, Matthias %B European Conference on Information Systems (ECIS) %C Utrecht, Netherlands (accepted for publication) %D 2013 %K Technology-mediated itegpub learning productivity pub_msö pub_pbi service services success training %T Towards a Productivity Measurement Model for Technology Mediated Learning Services