Book excerpt: Complexity is a gift that can be made available for the successful implementation of projects, and used to create a new order or to change an existing one. Based on scientific facts, the authors present a systematic approach, which integrates complexity and its multitude of facets and gives practical recommendations for dealing with complexity in projects. The methods paradigm in project management is currently undergoing a massive upheaval. Projects are complex entities that cannot be tackled using traditional methods, such as classical cause and effect approaches. Complexity, and the associated phenomenon of self-organization, is a natural, but hidden designer. It offers a great opportunity in its use as a key driver for the implementation of projects. This requires identification of the principles of complexity and then using these for project management. In this book, the latest findings from natural sciences and brain research are used and transferred within a practice-oriented framework. The authors describe the methods of complexity regulation in projects and how self-organization for the management of projects can be applied.