Langage ImplemeNTation Systeme. A predecessor of Ada developed by Ichbiah in 1973. It was influenced by Pascal' s data structures and Sue' s coNTrol structures. A type declaration can have a low-level implemeNTation specification. ["The System ImplemeNTation Language LIS", J.D. Ichbiah et al, CII Honeywell-Bull, TR 4549 E/EN, Louveciennes France (Dec 1974)]. ["The Two-Level Approach to Data IndependeNT Programming in LIS", J.D. Ichbiah et al, in Machine OrieNTed Higher Level Languages, W. van der Poel ed, N-H 1974, pp.161-169]. (1994-12-01)