In this case study we compare three process modelling techniques in order to find common concepts and to identify significant differences. We base this comparison around three general questions: What are the objectives of the organisation? Who is doing what with which resources? How does the organisation work? The answers to the third of these questions (''How does the organisation work?'') are quite similar for all three of the modelling techniques we examine here. The main differences, at the modelling level, appear when considering the answers to the first two.