: The modeling of strategies for deriving valid project plans is a core task in development process’s design. Strategies are used for planning and for the validation of concrete project plan-instances. Especially if using delivery-oriented planning, project managers need to know if they have all required deliverables available or if a scheduled project satisfies the process’s requirements. In this paper, we present a domain specific language (DSL) to model and validate a project plan as well as its execution. The DSL will support process engineers