Statistical Quality Control (SQC)

Statistical quality control or SQC involves the use of quantitative analysis techniques and statistics to determine if products or services are meeting a set benchmark in relation to a number of quality specifications or characteristics. This is done by random sampling of production and evaluating the sampled products versus performance benchmarks and determining the variation from this benchmark and/or the failure to meet it. The feedback from this process is then used in evaluating product quality and improvements necessary to the process in order to minimize variation from the benchmark and ensure all products made meet or exceed customer requirements.
Most of the statistical quality control methods involve calculating the mean for a performance criteria and the deviation exhibited by the sample around this mean, or between the upper and lower bounds of acceptable performance. The objective of statistical quality control is also to identify persistent changes in the output quality that cannot be attributed to normal variation or statistical noise.

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