Every large groupware project includes by necessity many different users. The top-down approach of the 80s and 90s is changing towards a more user centered approach. What implications does a focus on user involvement have on system acceptance of groupware systems? By looking at Jonathan Grudinâ€™s â€œEight Challenges for Developersâ€ , this thesis will analyze a modern groupware system compared to his recommendations for more user involvement. Some social issues will be analyzed within social capital theory, and the thesis is written within the MOSCITO Project. My study shows positive results of user involvement, but also the importance of management involvement and a good structured process. Inaccordance with some of Grudinâ€™s views, some groupware traps are avoided by integration into the everyday system. A positive work community may also be a factor of failure and success on system acceptance.