The growing pressure of innovation and competition is prompting many commercial and social enterprises to change quickly and purposefully. This organizational development textbook presents principles and strategies for shaping this complex process. It is based on an integrative consulting model that links a phase-oriented process model for solving complex problems and tasks with the principles of effectiveness and success factors that promote self-organization. In the interest of balancing theory and practice, the book includes numerous case studies, exercises, and guidelines for the practical implementation of change initiatives. Thus, the publication makes an important contribution to the professionalization of this consulting field. The content covers the framework conditions of organizational development, such as clarifying the mandate and process architecture.