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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
eighty-twenty rule
80/20 rule
The program-design version of the law of
diminishing returns. The 80/20 rule says that roughly 80% of
the problem can be solved with 20% of the effort that it would
take to solve the whole problem.
For example, parsing e-mail addresses in "From:" lines in
e-mail messages is notoriously difficult if you follow the RFC
2822 specification. However, about 60% of actual "From:"
lines are in the format "From: Their Name ", with a
far more constrained idea of what can be in "user" or "host"
than in RFC 2822. Another 25% just add double-quotes around
"Their Name". Matching just those two patterns would thus
cover 85% of "From:" lines, with a tiny portion of the code
required to fully implement RFC2822.
(Adding support for "From: user@host" and "From: user@host
(Their Name) " brings coverage to almost 100%, leaving only
really baroque things that RFC-2822 permits, like "From:
Pete(A wonderful \) chap) KISS Principle
(2003-11-17)