Process improvement involves analysis of different process redesign variants. Evaluation of all these variants might result in a large complicated process model or maintenance of several similar models. The paper proposes a process improvement scenario design and simulation approach aimed at simplifying the analysis of such interrelated models. The approach uses a base process as the evaluation foundation and particular process variants are created on demand according to explore a specific process improvement alternative. The paper describes this scenario design and simulation approach and provides an illustrative example of its application.