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OCR: click on any test for an illustration Test one point beyond Zone detects a shift in the mean an increase in the standard deviation or a single aberration the process For inter rpreting Test chart can be used to rule out increases in variation Test 2 Nine points in a row in Zone detects a shift in the process mean be vond Test 3 Six points in a row steadily detects trend or drift in the process mean Small trends increasing or decreasing will be signalled by this test before Test Test Fourt teen points in row detects systematic effects such as two alternately usea alternating up and down machines, vendors or operators Test TWO out of three points in row detects shift in the process average or increase in the r Zone or beyond standard deviation Any two out of three points provide positive tes ...