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Unit 4: Quality Control

Statistical Quality Control: Control that provides the basis for the philosophy of total quality Notes
management using statistical techniques for control of quality.

4.6 Review Questions

1. What are the attributes to define quality?
2. Philosophy of total quality management or continuous process improvement for
improving processes gave rise to two powerful tools. What are those tools?

3. What are the two types of control charts representing the two types of sampling?
4. What is statistical process control?
5. Explain checklists and tally charts as a common method to capture the data.
6. Quality has become a very serious issue in mass production systems, what are the analytical
tools used to check the quality?
7. What is the significance of Pareto Chart?
8. ‘Control charts are time-sequenced charts showing plotted values of a statistic including a
centerline average and one or more control limits’. Explain the statement highlighting the
significant usage of control charts.

9. The ‘p’ chart is set up in essentially the same manner as the ‘µ’ or X bar chart in the control
of variables. What is the usage of ‘P’ chart?
10. Why Statistical Process Control uses control charts?

Answers: Self Assessment

1. aesthetics 2. Safety

3. value 4. Serviceability
5. Durability 6. control
7. same 8. control charts
9. range 10. fraction

11. actual occurrence 12. nominal
13. form 14. data points
15. relative

4.7 Further Readings

Books Upendra Kachru, Production and Operations Management — Text and Cases, Excel
Books, New Delhi.
Chase, Richard B., and Eric L. Prentis, ‘Operations Management: A Field
Rediscovered’, Journal of Management, 13, no. 2 (October 1987): 351: 366.

Hayes, Robert H., Towards a ‘New Architecture’ for ROM, Production and Operations
Management, 9, no. 2 (Summer 2000) 105-110.

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