In our world of growing complexity, linear thinking and the belief that the whole is only the sum of its parts are evidently obsolete. Systems thinking, which promotes a holistic view of reality, is a situation-adequate handling of complex systems, and is therefore one of the most important skills of future executives in the business world. A new teaching concept was introduced one year ago by the Faculty of Business Administration at the University of Zurich, Switzerland. This concept was designed to help the students to develop abilities in thinking in models, operating complex systems and handling dynamic, non-linear situations. By use of a computer-simulated game the business students should gain knowledge about systemic realities and improve their complex-problem-solving skills. In the semester when the newly designed lecture started, the highly motivated class became aware of the problems in dealing with complexity. Documenting any significant improvements in our students’ performance in playing the game was not possible, but we observed a change in their behaviour and ways of thinking in situations of complex problem-solving. Some necessary changes and adjustments in the teaching concept were made and the next class will be investigated in autumn 2003.