This article presents ThirdSpace, a platform aiming at the integration of the learner centric and personalised Personal Learning Environments (PLE) with the more structured organisation of formal (institutional) learning. Towards this end, collaborative learning best practices are proposed to teachers through the WebCollage authoring tool. The resulting collaborative scripts are modelled using workflow technology and orchestrated automatically by a workflow engine. The ThirdSpace platform then allows the publication and monitoring of the learning activities in learners' PLEs. Thus, ThirdSpace enables the students to participate in the activities through their own self-configured PLEs, using the tools of their choice to engage both in individual and collaborative activities.