Business processes are constantly changing due to optimization, changes in legislation, or dissatisfaction among participants. Usually, process models are used as the basis for changing process behavior, but the models only provide limited information about possible risks, consequences, and vulnerability of the relationships between activities. Due to the lack of information, changes are implemented too hastily or not at all. In this paper, we elaborate on the relevant information for evaluating behavioral changes in the process. We present concepts and their relationships in a metamodel and show how the application of the metamodel can help to better assess process changes using the travel reimbursement process at a university. Furthermore, we discuss the potential of the proposed metamodel with regard to semi-automated business process redesign support.