«One unexpected result was that people often found making a model in Simula to be more useful than the actual simulation results. The process of describing the application provided a valuable insight in itself. This led Kristen to formulate one of his favorite aphorisms: _To program is to understand_. He thought programming should not be considered a low-level technical discipline designed just to accomplish a specific task, but that writing a program should enhance understanding of the problem domain and the solutions.»