Simula Begin
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Some problems with design and simulation of complex systems are pointed out. The use of special languages for specification and description of systems are mentioned. The effects of a hierarchical system design approach are described and by an example the connection to system simulation is shown. The example clearifies the advantages with a system description that is based on the system being divided into modules by function. Communication between modules by means of signals are looked upon in an abstract manner and the apparition of program structure is reviewed in this case. The program structure hold some advantageous properties which are examined and put in relation to program evaluation.