The increasing importance of unstructured, knowledge-intensive processes in enterprises is largely recognized. Conventional workflow solutions do not provide adequate support for the management and optimization of such processes. Therefore the need for more flexible approaches arises. This paper presents a conceptual framework for unobtrusive support of unstructured, knowledge-intensive business processes. The framework enables modeling, exchange and reuse of light-weight, user-defined task structures. In addition to the person-to-person exchange of best-practices, it further enables ‘outsourcing’ of dynamic task structures and resources in personal workspaces and organizational units where these are managed according to local domain knowledge and made available for reuse in shared repositories. The delegation of tasks enables the generation of enterprise process chains, spreading beyond the boundaries of a user’s personal workspace. The structures emerging from user-defined tasks, task delegations and on-demand acquisition of dynamic, externally managed tasks and resources adequately represent agile, human-centric business processes. Thereby the framework facilitates effective knowledge management and fosters proactive tailoring of underspecified business processes through end users in a light-weight, unobtrusive manner. The presented concepts are supported within the Collaborative Task Manager (CTM), a novel prototype for emailintegrated task management.