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SIMSCRIPT is a free-form, English-like general-purpose simulation language conceived by Harry Markowitz and Bernard Hausner at the RAND Corporation in 1962. It was implemented as a Fortran preprocessor on the IBM 7090[1] and was designed for large discrete event simulations. It influenced Simula.[2]

Though earlier versions were released into the public domain, SIMSCRIPT was commercialized by Markowitz's company, California Analysis Center, Inc. (CACI), which produced proprietary versions SIMSCRIPT I.5[3][4] and SIMSCRIPT II.5.


SIMSCRIPT II.5[5][6] was the last pre-PC incarnation of SIMSCRIPT, one of the oldest computer simulation languages. Although military contractor CACI released it in 1971, it still enjoys wide use in large-scale military and air-traffic control simulations.[7][8]

SIMSCRIPT II.5 is a powerful, free-form, English-like, general-purpose simulation programming language. It supports the application of software engineering principles, such as structured programming and modularity, which impart orderliness and manageability to simulation models.[9]


SIMSCRIPT III[10] Release 4.0 was available by 2009,[11] and by then it ran on Windows 7, SUN OS and Linux and has Object-oriented features.[12]

By 1997, SIMSCRIPT III already had a GUI interface to its compiler.[13] The latest version is Release 5; earlier versions already supported 64-bit processing.[14]

PL/I implementation[edit]

A PL/I implementation was developed during 1968-1969, based on the public domain version released by RAND corporation.[15]

See also[edit]


  1. ^ Reviews, C. T. I. (2016). Simulation With Arena. ISBN 978-1467273411. SIMSCRIPT ... was implemented asa Fortran preprocessor on the IBM 7090
  2. ^ Kristen Nygaard (1978). "The Development of the SIMULA Languages" (PDF). The development of .. SIMULA I and SIMULA 67... were influenced by the design of SIMSCRIPT ...
  3. ^ M. E. Kuhl. "The SIMSCRIPT III Programming Language for Modular Object ..." (PDF). ... and was followed by SIMSCRIPT I.5 from CACI in 1965
  4. ^ "A Look Back in Time: The CACI Story".
  5. ^ Philip J Kiviat (January 1973). Simscript II.5: Programming language. Consolidated Analysis Centers.
  6. ^ Edward C. Russell (1983). Building simulation models with SIMSCRIPT II.5. ISBN 9780918417008.
  7. ^ 1988 magazine quote: "today used principally by the U. S. military."
  8. ^ William G. Shepherd Jr. (September 1988). "Market Value - PCs on Wall Street". PC Computing. pp. 150–157.
  9. ^ Russell, Edward C. (1983). Building Simulation models with SIMSCRIPT II.5. Los Angeles: CACI.
  10. ^ "The SIMSCRIPT III programming language". doi:10.1109/WSC.2005.1574302. S2CID 8577001. SIMSCRIPT III is a programming language for discrete-event simulation. It is a major extension of its predecessor, SIMSCRIPT II.5, providing full support for ... {{cite journal}}: Cite journal requires |journal= (help)
  11. ^ "SIMSCRIPT III Object-Oriented, Modular, Integrated software development tool".
  12. ^ Harry M. Markowitz (2009). Selected Works. p. 152. ISBN 978-9814470216. I told Ana Marjanski, who headed the SIMSCRIPT III project, that SIMSCRIPT already has entities, attributes plus sets. She explained that the clients want object ...
  13. ^ "SIMSCRIPT III User's Manual" (PDF). June 26, 1997.
  14. ^ "CACI Products". Retrieved March 12, 2019.
  15. ^ Jack Belzer; Albert G. Holzman; Allen Kent (1979). Encyclopedia of Computer Science and Technology: Volume 13. ISBN 978-0824722630. SIMSCRIPT. This PL/I based version, first developed in 1968-1969 ... of SIMSCRIPT I, particularly in large simulations at The RAND Corporation

External links[edit]