BS ISO 7870-2:2023 – TC

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Tracked Changes. Control charts – Shewhart control charts

Published By	Publication Date	Number of Pages
BSI	2023	162

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Categories: 03.120.30 - Application of statistical methods, BSI

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PDF Catalog

PDF Pages	PDF Title
1	30471860
105	A-30435253
106	undefined
111	Foreword
112	Introduction
113	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
115	4 Concepts of Shewhart control charts 4.1 Shewhart control chart 4.2 Control limits 4.3 Process in statistical control
116	4.4 Action limits 4.5 Warning limits 4.6 Type 1 error 4.7 Type 2 error 4.8 Process not in control
117	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
118	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
119	6 Variables control charts 6.1 Usefulness of variables control charts 6.2 Assumption of normality
120	6.3 Pair of control charts 6.4 Average, chart and range, R chart or average, chart and standard deviation, s char
121	6.5 Control chart for individuals, X, and moving ranges, Rm
122	6.6 Control charts for medians,
123	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
124	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
125	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
126	8.2.4 Lack of control in both average and variation charts 8.2.5 Depiction of unnatural patterns
127	9 Process control, process capability, and process improvement 9.1 Process control
128	9.2 Process capability and improvement
130	10 Attribute control charts 10.1 Attribute data 10.2 Distributions 10.3 Subgroup size
131	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
132	11.3 Choice of rational subgroup 11.4 Frequency and size of subgroups
133	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
134	12.2 Determine data collection strategy
135	12.3 Data collection and computation 12.4 Plotting chart and R chart
136	13 Caution with Shewhart control charts 13.1 General caution
138	13.2 Correlated data 13.3 Use of alternative rules to the three-σ rule
139	Annex A (informative) Illustrative examples
158	Annex B (informative) Practical notices on the pattern tests for assignable causes of variation
160	Bibliography