never change a running system

If something is performing or functioning well enough, there's no need to change or interfere with it (as you may introduce new problems as a result.) Usually used in reference to computing. A: "We don't really need to implement these ridiculous security changes, do we? When our current method is working just fine?" B: "Right. Never change a running system, that's what I always say."

See also: change, never, running, system

See also:

if it ain't broke don't fix it
if it ain't broke, don't fix it
don't change a winning team
if it ain't broken, don't fix it
if it isn't broke, don't fix it
if it isn't broken, don't fix it
gum the works up
gum up the works
screw up the works
on song

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