![]() Other sets of rules, common enough to have an identifying name, i.e. Different industries across the globe have have developed their own variants on the WECO Rules. in the 1920’s, these quality control guidelines were codified in the 1950’s and form the basis for all of the other rule sets. First implemented by the Western Electric Co. The most popular of these are the Western Electric Rules, also know as the WECO Rules, or WE Runtime Rules. These rules utilize historical data and look for a non-random pattern that can signify that the process is out of control, before reaching the normal ☓ sigma limits. Other, more complex tests rely on more complicated decision-making criteria. ![]() Once a process is brought under control using the simple 3-sigma level tests, quality engineers often want to increase the sensitivity of the control chart, detecting and correcting problems before the 3-sigma control limits are reached. In this case, a simple threshold test determines if a process is in, or out of control. The normal SPC control limit rules display at the 3-sigma level, both high and low. ![]()
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