Abstract
A socio-cultural approach (SCA) to project management focuses on the social and cultural ecology of involved organizations and participants (actors). The SCA requires crossing boundaries, authoring practice, and translating it to actors as important skills of a project manager (PM) in order to manage and exercise leadership in organizing an extended poly-organizational project community. An interview research to high level PMs showed several actual boundaries and ways to cross and dissolve them. Based on the discussion I proposed a model in which understanding actors' situated Mie (objective and subjective views) by dialogue with him/her and co-authoring stories to cross and dissolve boundaries would create extended involvement and changes in organizations.