Do you typically organize your project plan according to the project life cycle, process groups or some other way?

Thanks, Rami. It sounds like I'm on the right track then. Each project (implementation) includes multi-phase work streams, so I am listing the associated processes within the relevant process groups. As a simplified example, for one type of service, the PMs need to conduct data gathering and understand the client structure (initiating) before they can align with the client on the approach (planning) and then create the appropriate communications (executing).

very interesting question
in my opinion, the first thing to de is to set-up milsotones at point where the vertical concerns are joined(technology, service delivery design, financial services).

Good point, Rami. I will review the activities to ensure they are grouped correctly. Closing typically includes archiving documents, recording lessons learned and formulating a post-implementation plan, but these are generic. I will look for closing processes specific to the individual work streams.