second-system effect n.
(sometimes, more euphoniously, `second-system syndrome') When one is designing the successor to a relatively small, elegant, and successful system, there is a tendency to become grandiose in one's success and design an [elephantine] feature-laden monstrosity. The term was first used by Fred Brooks in his classic "The Mythical Man-Month: Essays on Software Engineering" (Addison-Wesley, 1975; ISBN 0-201-00650-2). It described the jump from a set of nice, simple operating systems on the IBM 70xx series to OS/360 on the 360 series. A similar effect can also happen in an evolving system; see [Brooks's Law], [creeping elegance], [creeping featurism]. See also [Multics], [OS/2], [X], [software bloat].
This version of the jargon lexicon has been described (with altogether too much truth for comfort) as an example of second-system effect run amok on jargon-1....
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