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This paper introduces a new notation called S which is based on higher order logic. It has been developed specifically to support the practical application of formal methods in industrial scale projects. The development of S has occurred in the context of an investigation into the possibility of using formal specification techniques in the development of a $400 million air traffic control system. We were motivated to develop this notation after reaching the conclusion that existing notations such as Z are not suitable for use in this particular project. In addition to providing an introduction to S, this paper describes a public domain software tool called "Fuss" which has been implemented to support the use of S as a specification language.  
 

This paper is from the Proceedings of the 1994 International Meeting on Higher Order Logic Theorem Proving and its Applications, Lecture Notes in Computer Science, vol. 859, pp.285-299, Springer-Verlag.