Source : Free On-Line Dictionary of Computing

On-line Process Synthesizer
     
         (OPS) A system for {discrete simulation} under
        {CTSS} developed by M. Greenberger at {MIT} ca. 1964.
     
        [Sammet 1969, p.660. Versions: OPS-3, OPS-4. "On- line
        Computation and Simulation: The OPS-3 System", M. Greenberger
        et al, MIT Press 1965].
     
        (2003-04-05)