This book provides the reader with concrete assistance for improving organizational performance based on proven models and a comprehensive representation of the functions and objectives of internal communication and change management. This presentation offers insights into understanding communication processes and encourages the reader to reflect on everyday communication processes within the company. Since communication processes and media, along with their associated effects, are often difficult to assess, the book presents general controlling instruments and specific key figures that enable the evaluation and management of internal corporate communication. Given the high importance of effective communication in implementing changes within organizations, the author specifically addresses internal communication in change management. Preconditions are discussed.