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Second-system effect
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<p>The second-system effect or second-system syndrome is the tendency of small, <a href="/facts/Elegant/NrPbHNjc">elegant</a>, and successful systems to be succeeded by <a href="/facts/Overengineering/TBkv5g7k">over-engineered</a>, <a href="/facts/Software_bloat/glhQsSYt">bloated</a> systems, due to inflated expectations and overconfidence. </p><p>The phrase was first used by <a href="/facts/Fred_Brooks/1FNtgMgE">Fred Brooks</a> in his book <i><a href="/facts/The_Mythical_Man-Month/wCXlLFQo">The Mythical Man-Month</a></i>, first published in 1975. It described the jump from a set of simple operating systems on the <a href="/facts/IBM_700%2f7000_series/8Gh15FSj">IBM 700/7000 series</a> to <a href="/facts/OS%2f360/nQbdNbx6">OS/360</a> on the 360 series, which happened in 1964. </p>