Abstract:The Shewhart control chart is a common approach for internal quality control, which consists of several types. In food chemical analysis, the testing results are usually the average of several replicates. This paper describes the selection of a type of control chart on basis of mathematical module of test result, the selection of proper control samples and questions in establishing and changing control limits. In addition, the difference between the control chat used in food manufacturing and in food chemical analysis was briefly explained.
