Essential complexity refers to a situation where all reasonable solutions to a problem must be complicated (and possibly confusing) because the "simple" solutions would not adequately solve the problem. It stands in contrast to accidental complexity, which arises purely from mismatches in the particular choice of tools and methods applied in the solution.
This term has been used since, at least, the mid-1980s. Turing Award winner Fred Brooks has used this term and its antonym of accidental complexity since the mid-1980s. He has also updated his views in 1995 for an anniversary edition of Mythical Man-Month, chapter 17 "'No Silver Bullet' Refired".
Read more about Essential Complexity: Cyclomatic Complexity
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