STATEMATE

Statemate is a visual modeling and simulation tool for designing and validating the behavior of embedded systems using statecharts and sequence diagrams. Originating in the 1980s from I-Logix, it provides a graphical environment to specify states, transitions, events, and actions, and to simulate the dynamic behavior of a system before implementation.

Key features include hierarchical and extensible state machines (Harel statecharts), timing and concurrency semantics, integrated simulation, animation, and debugging, as well as code generation for languages such as C and C++. It supports requirements-driven development by linking diagrams to specifications and test cases, and can be integrated with other design and verification tools.

In the industry, Statemate was widely used in aerospace, automotive, and defense sectors for modeling complex control systems and validating behavior early in development. The product line was later acquired by Telelogic in 2006, and Telelogic was acquired by IBM in 2008, after which Statemate continued under the IBM Rational umbrella (often marketed as Rational Statemate) for a time, with functionality gradually integrated into other Rational tools such as Rhapsody.

Today, Statemate as a standalone product is largely retired, with its model-based design capabilities reflected in newer tooling and methodologies within Rational's suite and other modeling platforms. It is regarded as a significant early tool in the rise of executable modeling and model-based design for embedded systems.