The best definition I've heard for "bug" is "software not working as documented". Of course, a lot of software is lacking documentation -- and those are doc bu

The best definition I've heard for "bug" is "software not working as documented". Of course, a lot of software is lacking documentation -- and those are doc bugs. But I like this definition because even when the docs are incomplete, the definition guides you to ask: would I really document that the software behaves like this or would I change the behavior [and document that]? It's harder (at least for me) to sweep goofy behavior under the rug.