Main Page | See live article | Alphabetical index Cyclometric complexity ("M") is one larger than the number of decision points (IFs, UNTILs, ENDs...) in a module (function, procedure...). McCabe's rule of thumb is that "modules" with M of ten or more are error-prone. CASE structures are an exception. They can have more than ten decisions without increasing the likelihood of errors. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.