This Recommendation focuses on project management (PM) across companies. The document describes the project management tasks within the product development process (PDP) in the automotive industry that extend across the borders of partner enterprises, and focuses1 on time management, activity management and communication management. It covers the processes, roles, methods, information, language and culture in collaboration projects. The Recommendation explicitly excludes project management within the enterprises involved. The recommendation is published in two parts. Part 1 contains the reference model and Part 2 contains the data model for exchanging project data.