[[A horizontal line has four points labeled on it, with the second point from the left marked with a dashed vertical line dividing the horizontal line into two parts. An arrow labeled "Solve problems" points left from the vertical line. An arrow labeled "Create problems" points right from the vertical line. The points are labeled, from left to right, "Tools that don't need a manual", "Tools that need a manual", "Tools that need a manual but don't have one", and "Tools whose manual starts with 'how to read this manual'".]]

{{Title text: The most ridiculous offender of all is the sudoers man page, which for 15 years has started with a 'quick guide' to EBNF, a system for defining the grammar of a language. 'Don't despair', it says, 'the definitions below are annotated.'}}