This paper investigates the use of a construct called the system anatomy for planning and controlling projects developing complex systems. The anatomy shows, in a compact form, the most crucial dependencies in the system from the perspective of how it ‘comes-to-life’, hence the concept of an ‘anatomy’. The key point in using the anatomy for project planning is to develop and verify the system in the same order as it ‘comes-to-life’. The project plan in made up in three steps. The first step is to define the anatomy itself. This is followed by the group-ing of functions into verifiable integration steps called increments. Finally, regular time and resource plans are made for each increment. Thus, the planning can be characterized as an integration driven procedure. This ap-proach has been used extensively at Ericsson, a leading manufacturer of telecommunication systems world wide. It has proven to be very successful, especially in terms of promoting communication and developing a shared under-standing about the project.