To build cooperative and disrtibuted computer systems one thing is needed most: consistency. This means all participants in a distributed system need access to the same data to make consistant decisions. The key problem in this issue is that the time needed by standard decision making algorithms is dominated by the network. In applications like sensor networks or virtual communities this time is too high to meet the required response times. Optimistic approaches solved this problem by preliminary decisions in smaller networks (<= 20 nodes). The Condel project will enhance these algorithms to work in huge and error-prone networks with varying participants.