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BS ISO 7870-2:2023

BS ISO 7870-2:2023

$198.66

Control charts – Shewhart control charts

Published By Publication Date Number of Pages
BSI 2023 58
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PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
3.1 General presence
3.2 Symbols
3.2.1 For the purposes of this document, the following symbols apply
11 4 Concepts of Shewhart control charts
4.1 Shewhart control chart
4.2 Control limits
4.3 Process in statistical control
12 4.4 Action limits
4.5 Warning limits
4.6 Type 1 error
4.7 Type 2 error
4.8 Process not in control
13 4.9 Phase 1 of statistical process control
4.10 Phase 2 of control charts
5 Types of control charts
5.1 Types of Shewhart control charts
5.2 Control charts where no pre-specified values of process parameters are given
14 5.3 Control charts with respect to given pre-specified values of process parameters
5.4 Types of variables and attribute control charts
5.4.1 Variables control charts
5.4.2 Attribute control charts
15 6 Variables control charts
6.1 Usefulness of variables control charts
6.2 Assumption of normality
16 6.3 Pair of control charts
6.4 Average,  chart and range, R chart or average,  chart and standard deviation, s char
17 6.5 Control chart for individuals, X, and moving ranges, Rm
18 6.6 Control charts for medians, 
19 7 Control procedure and interpretation for variables control charts
7.1 Underlying principle
7.2 Collect preliminary data
7.3 Examine s (or R) chart
7.4 Homogenization for s (or R) chart
20 7.5 Homogenization for  chart
7.6 Ongoing monitoring of process
8 Unnatural pattern and tests for assignable causes of variation
8.1 Natural pattern
21 8.2 Unnatural patterns
8.2.1 General
8.2.2 Lack of control in the average chart only
8.2.3 Lack of control in the variation chart only
22 8.2.4 Lack of control in both average and variation charts
8.2.5 Depiction of unnatural patterns
23 9 Process control, process capability, and process improvement
9.1 Process control
24 9.2 Process capability and improvement
26 10 Attribute control charts
10.1 Attribute data
10.2 Distributions
10.3 Subgroup size
27 10.4 Control chart for fraction nonconforming (p chart)
11 Preliminary considerations before starting a control chart
11.1 Choice of critical to quality (CTQ) characteristics describing the process to control
11.2 Analysis of the process
28 11.3 Choice of rational subgroup
11.4 Frequency and size of subgroups
29 11.5 Preliminary data collection
11.6 Out of control action plan
12 Steps in the construction of control charts
12.1 Typical format of a standard control chart form
30 12.2 Determine data collection strategy
31 12.3 Data collection and computation
12.4 Plotting  chart and R chart
32 13 Caution with Shewhart control charts
13.1 General caution
34 13.2 Correlated data
13.3 Use of alternative rules to the three-σ rule
35 Annex A (informative) Illustrative examples
54 Annex B (informative) Practical notices on the pattern tests for assignable causes of variation
56 Bibliography

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BS ISO 7870-2:2023
$198.66