COMMERCE 4OB3 Chapter 3: 3QC3-CH3.docx
11 Apr 2012
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Document Summary
Statistical process control (spc): involves monitoring the production process to detect and prevent poor quality. Employee training in spc is a fundamental principle of tqm. Sample: a subset of the items produced to use for inspection. All processes have variability-random and nonrandom (identifiable, correctable) Spc is a tool for identifying problems in order to make improvements. Attribute: a product characteristic that can be evaluated with a discrete response. Variable measure: a product characteristic that is continuous and can be measured (weight, length) A service defect is a failure to meet customer requirements. Control chart: a graph that established the control limits of a process. A pattern can indicate an out-of-control process even if sample values are within control limits. Run: a sequence of sample values that display the same characteristic. Pattern test: determines if the observations within the limits of control chart display a nonrandom pattern. Control limits: the upper and lower bands of a control chart.
