BS 5702-1:2001

Committees responsible
Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Symbols
5 Preparation for control charting
6 Types of variables charts
7 Setting up the control chart
8 Using the control chart
Annex A (normative) Analysis of subgroup data
Annex B (informative) Control charts with
        probabilistic action lines and warning lines
Annex C (informative) Tables of values of c4/c4 and c4
Bibliography
Figure 1 - Recommended control chart layout for X/R chart
Figure 2 - Flowchart for the collection and analysis of
           preliminary data to set up a control chart
Figure 3 - Example of a typical reaction plan for a
           production process
Figure 4 - Typical patterns and trends to look for in
           the analysis of range control charts
Figure A.1 - Range control charts
Figure A.2 - Processes out-of-control for ranges with
             patterns or trends within the control lines
Figure A.3 - Average (X) charts
Figure A.4 - Process out-of-control for averages with
             patterns or trends within the control lines
Table 1 - X scale as a function of subgroup size
Table 2 - Factors for the calculation of control and
          warning lines
Table A.1 - Significant run lengths
Table B.1 - Factors for the calculation of probabilistic
            control limits of X plots.
Table B.2 - Factors for the calculation of probabilistic
            control limits for R and s charts
Table C.1 - Values of c4/c4
Table C.2 - Values of c4

Defines method of statistical process control that involves charting measurements of a given characteristic. Outlines accepted methods of sampling and charting that are easy to use and can safely and profitably replace routine inspection.

This part of BS5702 describes a method of statistical process control that involves charting measurements of a given characteristic. It sets out accepted methods of sampling and charting that are easy to use and that often can safely and profitably replace routine inspection. These charts indicate both the level and variability of the characteristic.

The control aspects of Shewhart-type variables charts for mean, median, range and standard deviation, using both Shewhart and probabilistic control limits, are described.

Guidance is given to persons concerned with making decisions on products and processes. The charting techniques outlined may be employed to establish and maintain process control over the charted characteristic.

No attempt is made to deal at length with the statistical principles underlying the methods described in this standard.