This paper outlines one approach taken in designing a software system for the production of high quality software for use in gas turbine control applications. Central to the approach is a special control language with its inherent features of visibility, reliability and testability, leading to a software system which can be applied to applications in which the integrity of the units is of prime importance. The structure of the language is described together with the method of application in the field of aircraft gas turbine control. The provision of documentation automatically is an integral part of the system together with the testing procedures and test documentation. A description of how these features are combined into the total software system is also given.

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