This book provides a theoretical foundation for both the practical design of an equality-oriented personnel policy and for further research. It focuses on fundamental questions and debates about gender and diversity in (work) organizations. The authors present a range of theoretical approaches to understanding gender and diversity and discuss design-oriented concepts in the context of their historical development in the German-speaking world. The book follows the work "Equality through Personnel Policy," which was last published in its sixth edition by Gertraude Krell, Renate Ortlieb, and Barbara Sieben. It offers guidance in a complex scientific field and provides well-founded arguments for practice. It is aimed at personnel managers as well.