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In software engineering, as in any collective endeavor, understanding and supporting collaboration is a major concern. Unfortunately, the main concepts of popular process formalisms are not always adequate to describe collaboration. We extend the Software & System Process Engineering Meta-Model (SPEM) by introducing concepts needed to represent precise and dynamic collaboration setups that practitioners create to address ever-changing challenges. Our goal is to give practitioners the ability to express evolving understanding about collaboration in a formalism suited for easy representation and tool-provided assistance. Our work is based on a collaborative process metamodel we have developed. In this paper, we first present a meta-process for process modeling and enactment, which we apply to our collaborative process metamodel. Then we describe the implementation of a suitable process model editor, and a project plan generator from process models.