In product development close collaboration between systems integrators and suppliers is important. The purpose of this article is to investigate the impact of the work breakdown structure (WBS) and work packages (WP) in product development on the possibilities to carry through the strategy of supplier involvement into collaborative practice and to investigate how supplier involvement can be improved by altering the design of collaborative WBS and WP structures. Dependence Structure Matrix (DSM) is introduced in order to analyze, visualize and manage interdependencies, in terms of information exchange between systems integrator and supplier. This article shows how DSM can support alternative design of integrated and collaborative WBS and integrated WP following the logic of dependencies and the flow of information in order to support a strategy focusing on integration of suppliers on the project and team level.