: In electronic commerce, two fundamental types of models are business models and process models. While a business model is concerned with value exchanges between actors, a process model describes the procedural realization of business requirements. There is a need for methodological guidelines and tool support to move from a business model to a process model, which enables design decisions to be based on requirements captured in the business model. This paper addresses a systematic transformation of business models to process models. We propose a designer assistant that systematically aids a designer in generating a process model in an executable process modeling language.