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For example an ecommerce order tracking system with different status (in cart, paid, shipped, returned, so on). Spree solves it very elegantly, look at those "

• pantulis 6y ago
  I also happened to work in a very huge C++ project for the business logic component of a call center, using CORBA and the Reactor pattern from ACE to integrate different parts of the user / ACD / 1st agent / specialist / CTI combo. But it was a telco project, so the "let's use a FSM" was well thought from the beginning. Turns out you could easily know what the system would do just by reading a huge Smartdraw document, and this also allowed for reasoning on new use case scenarios. It did not matter that the main file was a horrendous 40kLOC C++ class because the Smartdraw diagram was the documentation and everything else was just trivial code.