This course will provide an overview of central organization theories discussing their relevance both in scientific and practical terms. The field of organization studies is characterized by a plurality of different theories which offer different approaches to studying the life in and around organizations. This lecture shows that the critical assessment of organizational phenomena can benefit from going beyond merely economic approaches and acknowledging also the wide range of relevant sociological and socio-psychological paradigms. In this vein, this lecture will present and discuss the diversity of perspectives for studying organizations: The historical development of different paradigms will be reflected, the different theoretical approaches will be presented and their practical relevance will be discussed.