||The paper deals with process patterns based on Coloured Petri-Nets as a process model to coordinate planning in structural engineering, e.g. geotechnical engineering. Coloured Petri-Nets are mathematically well-founded, and are often used to solve problems concerning concurrency in processes in other engineering domains. The paper introduces a new method to represent geotechnical information in Coloured Petri-Nets, thus enabling a content-based control over design process. Elementary process patterns are introduced, which serve as smallest modules in a bottom-up approach to the more complex process models.