Econd-system Effect: N. (sometimes, More Euphoniously

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: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

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....
-- The AI Hackers Dictionary