Collaboration, either inter or intra-organization is a critical business function that demands skills and knowledge spanning a wide range of domains including social, business and technical domains. Collaboration patterns can be a means to capture best practices about recurring collaborative problems and solutions. Many forms of patterns have been proposed addressing specific aspects of collaboration such as business interaction design and workflow. In this paper we propose a novel collaboration pattern model that aims to constitute a framework capable to describe recurring collaborative activities taking place in the context of virtual organisations.