GPSS-FORTRAN is a simulator for the simulation of discrete, continuous, and combined models. Provides a reference for GPSS-FORTRAN Version 3 and illustrates the use of the lan- guage by numerous examples.

0. Introduction.- 0.1 The Structure of the Simulator GPSS-FORTRAN Version 3.- 0.2 Modelling.- 0.3 Ease of Use.- 0.4 Acknowledgements.- 1. The Flow Control.- 1.1 Model Classification.- 1.2 State Transitions.- 1.3 The Subroutine FLOWC.- 1.4 Simultaneous Activities.- 2. The Simulation of Continuous Systems.- 2.1 Differential Equations in GPSS-FORTRAN Version 3.- 2.2 Scheduled State Transitions.- 2.3 Conditional State Transitions.- 2.4 The Subroutine EQUAT.- 2.5 Adding to or Removing from a Chain Using TCHAIN andNCHAIN.- 2.6 Integration Methods.- 3. Queued Models.- 3.1 Transactions.- 3.2 Subroutines for Processing Transactions.- 3.3 An Example of a Model.- 4. Stations and Queued Models.- 4.1 Facilities.- 4.2 Multifacilities.- 4.3 Pools and Storages.- 4.4 Coordination in Processing Paths.- 4.5 Families.- 4.6 Match Stations.- 5. Evaluation and Representation of the Results.- 5.1 The Behaviour of the Queues.- 5.2 The Computation of Frequency Tables.- 5.3 Output of the State of the Model.- 5.4 Auxiliary Aids.- 6. The Generation of Random Numbers.- 6.1 Generators of Random Numbers.- 6.2 Generation of Uniformly Distributed Random Numbers.- 6.3 Generation of Random Numbers with an Arbitrary Distribution.- 6.4 Random Numbers in GPSS-FORTRAN Version 3.- 7. Input and Output.- 7.1 Free Format Input.- 7.2 Output of Plots.- 7.3 Output of Bar Charts Using GRAPH.- 7.4 Operational Modes.- 7.5 Graphic Representation.- References.

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