BS 7785:1994

Committees responsible
National foreword
Introduction
Guide
1. Scope
2. Symbols
3. Nature of Shewhart control charts
4. Types of control charts
5. Variables control charts
6. Control procedure and interpretation for variables
     control charts
7. Pattern tests for assignable causes of variation
8. Process control and process capability
9. Attributes control charts
10. Preliminary considerations before starting a control
     chart
11. Steps in the construction of control charts
12. Illustrative examples: Variables control charts
13. Illustrative examples: Attributes control charts
Annex
A. (informative) Bibliography
Tables
1. Control limit formulae for Shewhart variables
     control charts
2. Factors for computing control chart lines
3. Control limit formulae for control charts for
     individuals
4. Values of A4
5. Control limit formulae for Shewhart attributes
     control charts
6. Tea packing process
7. Production data on the outside radius of a plug
8. Percent moisture for 10 successive samples of skim
     milk powder
9. Control data for thickness of mica discs
10. Preliminary data: Switches
11. Radio transistors: p chart (initial data)
12. Preliminary data: Video tape
13. Tyre manufacturing plant: Number of nonconformities
     per unit (units inspected per subgroup, n = 15)
Figures
1. Outline of a control chart
2. Tests for assignable causes
3. Strategy for process improvement
4. General format of a control chart
5. Average and range chart for data given in table 6
6. Average and range charts for data given in table 7
7. Revised X and R charts for data given in table 7
8. Control charts for individuals, X, for data given
     in table 8
9. Meridian chart and range chart for data given in
     table 9
10. p chart for data given in table 10
11. np chart for data given in table 10
12. Revised p chart for data given in table 11
13. c chart for data given in table 12
14. u chart for data given in table 13

Establishes a guide to the use and understaning of the Shewharf control chart approach to the methods for statistical control of a process. Coverage includes symbols, types of control charts, variables control charts, attributes control charts, and control procedure and interpretation for variable control charts. Also gives detailed tables and diagrams.