Prilla, MichaelRitterskamp, Carsten2017-09-142017-09-142006978-1-58603-604-1The concept of co-ownership well-known from real-life collaboration is a valuable means to support work with documents in groupware systems. In this paper, we present an approach leading to the practical appliance of co-ownership in a groupware system and show how this concept can be used to foster collaboration. Our efforts are supported by a review of related systems and concepts as well as a requirements analysis based on scenarios.en