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BS ISO 7870-2:2023 - TC Tracked Changes. Control charts - Shewhart control charts, 2023
- 30471860
- A-30435253 [Go to Page]
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 General presence
- 3.2 Symbols [Go to Page]
- 3.2.1 For the purposes of this document, the following symbols apply
- 4 Concepts of Shewhart control charts [Go to Page]
- 4.1 Shewhart control chart
- 4.2 Control limits
- 4.3 Process in statistical control
- 4.4 Action limits
- 4.5 Warning limits
- 4.6 Type 1 error
- 4.7 Type 2 error
- 4.8 Process not in control
- 4.9 Phase 1 of statistical process control
- 4.10 Phase 2 of control charts
- 5 Types of control charts [Go to Page]
- 5.1 Types of Shewhart control charts
- 5.2 Control charts where no pre-specified values of process parameters are given
- 5.3 Control charts with respect to given pre-specified values of process parameters
- 5.4 Types of variables and attribute control charts [Go to Page]
- 5.4.1 Variables control charts
- 5.4.2 Attribute control charts
- 6 Variables control charts [Go to Page]
- 6.1 Usefulness of variables control charts
- 6.2 Assumption of normality
- 6.3 Pair of control charts
- 6.4 Average,  chart and range, R chart or average,  chart and standard deviation, s char
- 6.5 Control chart for individuals, X, and moving ranges, Rm
- 6.6 Control charts for medians, 
- 7 Control procedure and interpretation for variables control charts [Go to Page]
- 7.1 Underlying principle
- 7.2 Collect preliminary data
- 7.3 Examine s (or R) chart
- 7.4 Homogenization for s (or R) chart
- 7.5 Homogenization for  chart
- 7.6 Ongoing monitoring of process
- 8 Unnatural pattern and tests for assignable causes of variation [Go to Page]
- 8.1 Natural pattern
- 8.2 Unnatural patterns [Go to Page]
- 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
- 8.2.4 Lack of control in both average and variation charts
- 8.2.5 Depiction of unnatural patterns
- 9 Process control, process capability, and process improvement [Go to Page]
- 9.1 Process control
- 9.2 Process capability and improvement
- 10 Attribute control charts [Go to Page]
- 10.1 Attribute data
- 10.2 Distributions
- 10.3 Subgroup size
- 10.4 Control chart for fraction nonconforming (p chart)
- 11 Preliminary considerations before starting a control chart [Go to Page]
- 11.1 Choice of critical to quality (CTQ) characteristics describing the process to control
- 11.2 Analysis of the process
- 11.3 Choice of rational subgroup
- 11.4 Frequency and size of subgroups
- 11.5 Preliminary data collection
- 11.6 Out of control action plan
- 12 Steps in the construction of control charts [Go to Page]
- 12.1 Typical format of a standard control chart form
- 12.2 Determine data collection strategy
- 12.3 Data collection and computation
- 12.4 Plotting  chart and R chart
- 13 Caution with Shewhart control charts [Go to Page]
- 13.1 General caution
- 13.2 Correlated data
- 13.3 Use of alternative rules to the three-σ rule
- Annex A (informative) Illustrative examples
- Annex B (informative) Practical notices on the pattern tests for assignable causes of variation
- Bibliography [Go to Page]
