A valuable division of contractual responsibilities between the programmer who implements an operation and the programmer who invokes it is provided by the operation's pre-condition. The implementer is free to write his code under the assumption that the pre-condition will hold, and the user's code must ensure that this is, indeed, the case. The usual approach for logical analysis of pre-conditions is known as total correctness and takes the view that nothing can be proved about an operation invoked outside its pre-condition: it may terminate with any value, may fail to terminate, or may destroy the machine on which it runs. A more general approach is that of General Correctness, which allows us to describe all the operations that total correctness can describe, but also allows us to give guarantees about what the result of executing an operation outside its pre-condition will be should that operation terminate. Amongst the topics we investigate are the specification (whilst preserving monotonicity of refinement) of concurrent operations running under a termination pact and Prescriptions which are the General Correctness formulation of Hoare-He Designs.
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