PSL/PSA

Defining Systems for more that 40 years

About PSL/PSA

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PSL/PSA has a history going back to late 1967/early 1968. It has a long and distinguished applied research foundation, probably the most extensive research project ever, in the modelling of requirements.
That solid research base was followed by a turbulent period of an attempted break-out into the commercial world. As a consequence of several decisions that, with the benefit of hindsight, were unfortunate, PSL/PSA as a separate product commercially available, ceased to be available. It is an absolutely classic example of how not to do a university commercial spinout to try to exploit new intellectual property!
Since PSL/PSA ceased to be available, there have been various attempts at new approaches to requirements modelling. The most widely used replacement is probably UML. <a title="افضل تونر للبشرة الدهنية" href="https://skin.onilacare.com/%d8%a7%d9%81%d8%b6%d9%84-%d8%aa%d9%88%d9%86%d8%b1-%d9%84%d9%84%d8%a8%d8%b4%d8%b1%d8%a9-%d8%a7%d9%84%d8%af%d9%87%d9%86%d9%8a%d8%a9/">تونر</a> However, one fundamental reason why life is being breathed back into PSL is precisely because of a widely held belief that UML has not yet demonstrated a capability that is a match for the capabilities of PSL/PSA. There is no doubt that the core of PSL/PSA needs some adjustment, but it has stood the test of time.
Therefore, PSL/PSA will be brought back to life with various incarnations. That is a substantial part of this website. The subsections of this history, discuss the past, present, and future in more detail.
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