The new programming model for parallel machines

A new model to help write programs which run concurrently in parallel machines, is discussed. This model takes the well known model of inter-communicating processes and refines it by: identifying processes with the evaluation of a function and eliminating many of the difficulties resulting from identifying processes with procedural programs; invoking process execution in two phases, ie., in the first phase pattern matching between a procedure call and a procedure definition is done and in the second phase actual process execution begins; and making it easy to express inter-process communication by ordered streams of data