Modeling Complex Behavior Simply Or How Much Is Too Much?
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Recently, hierarchical state models such as Hare1 statecharts have been vigorously promoted over flat (Mealy-Moore) state models as a panacea for complexity management. Unfortunately, hierarchical state models have a number of severe shortcomings: complex, difficult to learn notation; too many ways of saying the same thing; ill-defined semantics; layers of content-free hierarchy adding to and hiding system complexity; and so on.
[1] Edward F. Moore,et al. Gedanken-Experiments on Sequential Machines , 1956 .