To use a framework, developers need to understand its building blocks. In this paper, we present a clustering tech- nique that employs usage data from framework instantia- tions as examples to produce an overview of a framework's main building blocks as seen from a user's perspective. The evaluation of the approach by two case studies shows that the automatically generated building blocks are similar to a manually defined overview created by framework experts, even in cases where only few framework instantiations are available.