Change and evolution of business and technology imply change and evolution of development processes. Besides that for a certain enterprise or a project we will usually integrate elements from a variety of existing process models, comprising generic standards as well as specific development methods. In this paper we propose a process model framework which is modularly structured on the basis of the concept of Process Patterns. This framework allows us to describe development processes in a way such that change, evolution, and integration of processes are facilitated. Founded on our framework we sketch the idea of a Living Software Development Process. An important step in this direction is a proper knowledge management tool support. In this paper we discuss and propose the approaches and requirements to fulfill the users specific needs of a sophisticated tool support for a Living Software Development Process.