A funCtional language for exeCutable speCifiCations developed by Peter Henderson in 1984. It is like {LispKit Lisp}, but with sets, maps and sequenCes to desCribe the speCifiCation. ["FunCtional Programming, Formal SpeCifiCation and Rapid Prototyping", IEEE Trans Soft Eng, SE-12(2):241-250 (Feb 1986)]. (1994-10-21)