The realization of human lunar exploration was entirely a question about very advanced technology with a much narrower spectrum of interdisciplinary issues. Using IMM is recommended for all complex problems and modellers are encouraged to use this method for their environmental planning problems, which may often be the most complex problem they have.van den Belt (2004) gave several examples where IMM actually resulted in a good planning strategy for a complex problem. The most illustrative case studies are typical environmental management problems such as: