Smalltalk-80: the language and its implementation
Smalltalk-80: the language and its implementation
SIMULA: an ALGOL-based simulation language
Communications of the ACM
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Object oriented languages have been used successfully in such areas as simulation, systems programming, graphics, and Artificial Intelligence. Object oriented programming has become increasingly popular in the 1980's. Smalltalk™ is an object oriented language developed by Xerox, that has features particularly suited to simulation.The US Army Quartermaster School, in 1984, commissioned the Ballistic Research Laboratory to perform a study of the Graves Registration (GRREG) Service. The thrust of the study was to evaluate the GRREG requirements of the future battlefield and evaluate the ability of the GRREG system to meet these requirements. A large computer simulation was written in Smalltalk in order to perform the analysis.The GRREG services are best described as a network of queues, consisting of several hundred individual queues that are interconnected either in series or in parallel. The network will be described in three levels of detail, with the basic level consisting of the individual task queues, the intermediate level consisting of the three types of collecting points (initial, intermediate, cemetery), and the top level showing the flow from one collecting point to another.The recommendations of the study are intended to provide the Logistics Community a direction for changes in GRREG doctrine, procedures, and organizations. Those recommendations have been accepted by the Army. The BRL has performed several follow up studies using the Smalltalk simulation, and has ported the code to the US Army Logistics Center for use on their machines.