The aim of science is to develop true theories. From this it follows quite naturally that the Behavioural Approach is the only plausible approach in a Science of Human Resources Management. The Behavioural Approach derives its propositions from the best theories from the social and behavioural sciences. It is problem-oriented in the strictest sense and thus escapes discipline-specific narrow-mindedness. It integrates the knowledge bases necessary for good practice. The behavioural approach to human resources management is a success story, it leads to numerous new and far reaching insights.