This document, within the context of methods and tools for supporting the transitioning the organization's current development approach to software and systems product line engineering: — defines processes for product line transition management. Those processes are described in terms of purpose, inputs, tasks and outcomes; — defines method capabilities to support the defined tasks of each process; — defines tool capabilities that automate or semi-automate tasks and methods. This document does not concern processes and capabilities of tools and methods for a single system but rather deals with those for a family of products.