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We consider the following problem: For a system consisting of two components, the behavior of one component is known as well as the desired global behavior. What should be the behavior of the second component such that the behavior of the composition of the two conforms to the desired behavior ? - This problem has been called "submodule construction" or "equation solving". Solutions to this problem have been described in the context of various specification formalisms and various conformance relations. This paper presents a new formulation of this problem and its solution in first-order logic. It is also shown how the solutions for submodule construction in various specification formalisms can be derived from the solution in logic. The simple proof of correctness for the logic solution is then used to justify the particular forms of solutions in the different specification formalisms, such as (a) synchronous rendezvous at several interfaces, and (b) interleaved rendezvous (labeled transition systems).

Using First-Order Logic to Reason about Submodule Construction