“…The technical realization of authoring system, L(C)MS, and run-time system may range for example from local, monolithical architectures, to Web-based, distributed architectures [HK03,TDN03] or to architectures focusing on mobile devices [TR03]. Examples of projects using Web-based L(C)MS are Web Life Long Learning (W3L) [BBZ04], Wirtschaftsinformatik Online (WINFOLine) [ESSW01], Virtual Global University (VGU) [PS05b]. Other e-learning reference models focusing on different aspects can be found in [BBSS01, DT06b, STBZ + 05].…”