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Statechart is a visual language for software requirement specification that has been widely used in recent years. In essence, it extends the conventional language of state-transition diagrams with three elements that accommodates the notions of hierarchy, concurrency, and communication. Additionally, it allows multilevel concurrency, creation of chain-reaction effects, and the use of high-and low-level events. It is compact, expressive, compositional, and modular. This paper presents a tutorialdoi:10.7763/ijmlc.2012.v2.89 fatcat:3fevpkil4ngxlhyvwh4ozd4zdu