The objective of this study is to articulate the particular knowledge that is developed by participants in organizational-change projects. The study is based on the authour´s own experiences as a wage earners´ consultant. The scientific approach has been influenced by neo-pragmatism. The design perspective used is mainly based on Simon´s and Schön´s attempt to develop a general theory of practical knowledge. Organizations are viewed as artifacts and the participants in organizational-change as designers working in co-operation.