The features of GPSS are as follows:

• GPSS is a highly structured, special-purpose simulation programming language based on the process-interaction approach and oriented toward queuing systems.

• GPSS can be used to model any situation where transactions (entities, customers, units of traffic) are flowing through a system (e.g., a network of queues, with the queues preceding scarce resources)

• It is the first process-interaction simulation language.

• It is a flexible, yet powerful tool for simulation.

• GPSS/H includes built-in file and screen 1/0, use of an arithmetic expression as a block operand, an interactive debugger, faster execution, expanded control statements, ordinary variables and arrays, a floating point clock, built-in math functions, and built-in random-variate generators.

• The animator for GPSS/H is Proof Animation, which provides a 2D animation.