A wide-spectrum language integrates specification constructs into a programming language in a manner that treats a specification command just like any other command. This paper investigates a semantic model for a wide-spectrum language that supports concurrency and a refinement calculus. In order to handle specifications with rely and guarantee conditions, the model includes explicit environment steps as well as program steps. A novelty of our approach is that we define a set of primitive commands and operators, from which more complex specification and programming language commands are built. The primitives have simple algebraic properties which support proof using algebraic reasoning. The model is general enough to specify notions as diverse as rely-guarantee reasoning, temporal logic, and progress properties of programs, and supports refining specifications to code. It also forms an instance of an abstract concurrent program algebra, which facilitates reasoning about properties of the model at a high level of abstraction.
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