Simulations are very worthwhile exercises for students. A simulation is a good way to accomplish this. However it is not a true case if the facts come from the teacher's imagination rather than reality. There is considerable student motivation and educational advantages in using real cases. Truth is often stranger than fiction.
Students just seem to like trying to solve other people's real problems.
The first is the assignment phase. It may be important to take some time in class to go over the case and orient the students to its general focus and the exhibits. The second phase, which usually lasts from a few days to a few weeks, permits students to study the case in depth and to become familiar with the issues and decision options. This phase may be accomplished by having the students work individually or in small groups. Often students are asked to answer a set of questions during this time to assist them.