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. Language: English