Approaches to the development of scientific application software have matured over the past two decades and now constitute identifiable methodologies. Three software development methodologies are described, compared, and contrasted from the viewpoint of development effort, continued maintenance, and subsequent extension. Pertinent software aspects of the POLO‐FINITE system are described to provide an example of the software virtual machine approach to solve database, memory management, and processing module integration problems. Finally, possible extensions of the virtual machine concept are discussed as a means to further advance software development methodologies.
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