During the last few years, a large number of science-based games, simulations and case studies have been developed, and these are now starting to be built into the curricula of our schools, colleges and universities. The use of such exercises seems certain to increase as more and more teachers, lecturers and curriculum designers become aware of their great potential. Until now, however, these developments have been hampered by the fact that there has been no basic text on science-based games, and no source book to whcih potential users could refer to find out what exercises were available in their particular field. This book has been written in an attempt to fill both these gaps. - Introduction.