In the paper a new architecture for the design and evaluation of business process models is proposed. The architecture is based on the use of a semantic wiki system. It supports a distributed and collaborative modeling approach. In such a case, models can be created by a possibly distributed team of analysts. Moreover, they can be gradually improved using an integrated quality metrics system. We give the main architectural assumptions for this approach. Requirements for the system are described along with a prototype implementation. This system offers a practical tool support for the automation of the design and evaluation of models in a distributed environment.