Starting from the original purpose of justifying the existence of HR management by adding value and delivering results for customers and stakeholders, the American professor Dave Ulrich developed the HR Business Partner model. Initially consisting of four roles, the model has evolved to include nine roles, reflecting the "War for Talent" and the relevance of HR management for organizational success. The book offers a theoretical foundation and a practical approach to integrating HR development as a key challenge for delivering value, result orientation, and advancing Business Partnering within organizations.