Fascinating "Test" of Knowledge for Theory of Constraints

I recently ran across this web site which is a very realistic test of knowledge of Goldratt's Theory of Constraints. A Case Study of a small manufacturing company called Case Coil Limited. The "manager" of Case Coil has tried to cut costs and increase sales but despite all efforts, costs are increasing and margins are not sufficient. The case asks you to evaluate the situation and recommend a solution. Recommended.