A process control chart that also records the non-significant errors would provide a broader perspective.
The cycle-counting procedure will itself indicate when the desired level of record accuracy has been achieved through either a T-test or a review of the process control chart.
Process control charts could then be developed which not only compare overall performance with the standard but also look more closely at individual performances as Ott and Schilling have suggested.
Using statistical process control charts
can be very helpful in analyzing time series data and pointing to the actual occurrences of variation and limits of the current process (see Figure 1).
The software, operating on an Apple Macintosh computer, generates process control charts
, histograms, pareto analysis, scatter diagrams, attributes analysis, and gage-repeatability and reproducibility studies.
Typically, this involves establishing numerous process control charts to monitor status of production processes.
The major objective of process control charts is to obtain a quick feedback on the process status and in most cases the time lag due to sample inspection (en) is very small.
We believe that such studies help encourage implementation of economic approach to the design of process control charts and may provide insights to facilitate integration of online and offline quality decisions for total quality management.
Process control charts
have been used as a statistical process control (SPC) tool for: establishing the capability of the process given by its variance; and monitoring the process for any shift during operations.