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They measure what a process produces over time by choosing a sample size and periodically collecting data in samples of that size. There is a sampling plan chosen, range is calculated and upper and lower control limits determine the control chart. The control charts can show if a process is in statistical control or not . With the ease and availability of spreadsheet software it is often convenient to construct them using spreadsheet program.
Which are the service sectors that use such measurements?
Quality measures for mass service organizations such as restaurants and banks lend themselves to charting. Both front-room operations and back-room operations can be charted. Other examples include lockbox operation for banks,handling telephone orders and data-entry operations in large information processing company. The maintenance function of airlines is subject to sophisticated statistical process control.
Just imagine if latedepartures, lost baggage, overbooking and underbooking and other measures of customer service can be charted there could be a different light in which one could view the operational glitches and help correct them. Personalized services cannot be control charted.
For managing quality its good to have recurrent operations that could be easily analyzed and plotted.
An average marketer could work on building strategies based on the insights that are available not just from a customer but also quality control charts that help predict the breakdown in the operational system for a service . Any service related go to market strategy can be built on the historical data or pattern of the operations. Control charts can be a helpful tool used to predict this.
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