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BS ISO 3951-1:2013:2018 Edition

BS ISO 3951-1:2013:2018 Edition

$215.11

Sampling procedures for inspection by variables – Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL

Published By Publication Date Number of Pages
BSI 2018 106
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This part of ISO 3951 is primarily designed for use under the following conditions:

  1. where the inspection procedure is to be applied to a continuing series of lots of discrete products all supplied by one producer using one production process;

  2. where only a single quality characteristic, x, of these products is taken into consideration, which must be measurable on a continuous scale;

  3. where production is stable (under statistical control) and the quality characteristic, x, is distributed according to a normal distribution or a close approximation to the normal distribution;

  4. where a contract or standard defines a lower specification limit, L, an upper specification limit, U, or both; an item is qualified as conforming if and only if its measured quality characteristic, x, satisfies the appropriate one of the following inequalities:

    1. x ≥ L (i.e. the lower specification limit is not violated);

    2. x ≤ U (i.e. the upper specification limit is not violated);

    3. x ≥ L and x ≤ U (i.e. neither the lower nor the upper specification limit is violated).

Inequalities 1) and 2) are called cases with a single specification limit and 3), a case with double specification limits.

Where double specification limits apply, it is assumed in this part of ISO 3951 that conformance to both specification limits is equally important to the integrity of the product. In such cases, it is appropriate to apply a single AQL to the combined percentage of a product outside the two specification limits. This is referred to as combined control.

PDF Catalog

PDF Pages PDF Title
2 National foreword
8 Foreword
10 Introduction
13 1 Scope
2 Normative references
14 3 Terms and definitions
17 4 Symbols
18 5 Acceptance quality limit (AQL)
5.1 Concept
19 5.2 Use
5.3 Specifying AQLs
5.4 Preferred AQLs
5.5 Caution
5.6 Limitation
6 Switching rules for normal, tightened, and reduced inspection
20 7 Relation to ISO 2859‑1
7.1 Similarities
7.2 Differences
21 8 Consumer protection
8.1 Use of individual plans
8.2 Consumer’s risk quality (CRQ) tables
8.3 Producer’s risk tables
8.4 Operating characteristic (OC) curves
22 9 Allowing for measurement uncertainty
10 Planning
11 Choice between variables and attributes
23 12 Choice between the s-method and σ-method
13 Choice of inspection level and AQL
14 Choice of sampling scheme
14.1 Standard plans
24 14.2 Special plans
15 Preliminary operations
25 16 Standard procedures for the s-method
16.1 Obtaining a plan, sampling, and preliminary calculations
16.2 Acceptability criteria for single specification limits
27 16.3 Graphical method for a single specification limit
28 16.4 Acceptability criterion for combined control of double specification limits
16.4.1 General
16.4.2 Procedure for sample size 3
30 16.4.3 Procedure for sample size 4
31 16.4.4 Procedure for sample sizes greater than 4
33 17 Standard procedures for the σ-method
17.1 Obtaining a plan, sampling, and preliminary calculations
17.2 Acceptability criteria for a single specification limit
34 17.3 Acceptability criterion for combined control of double specification limits
35 18 Procedure during continuing inspection
36 19 Normality and outliers
19.1 Normality
19.2 Outliers
20 Records
20.1 Control charts
20.2 Lots that are not accepted
21 Operation of switching rules
37 22 Discontinuation and resumption of inspection
23 Switching between the s-method and σ-method
23.1 Estimating the process standard deviation
38 23.2 State of statistical control
23.3 Switching from the s -method to the σ -method
23.4 Switching from the σ -method to the s -method
40 24 Charts B to R — Operating characteristic curves and tabulated values for single sampling plans, normal inspection: s-method
24.1 Operating characteristic curves and tabulated values for sample size code letter B: s‑method
41 24.2 Operating characteristic curves and tabulated values for sample size code letter C: s‑method
42 24.3 Operating characteristic curves and tabulated values for sample size code letter D: s‑method
43 24.4 Operating characteristic curves and tabulated values for sample size code letter E: s‑method
44 24.5 Operating characteristic curves and tabulated values for sample size code letter F: s‑method
45 24.6 Operating characteristic curves and tabulated values for sample size code letter G: s‑method
46 24.7 Operating characteristic curves and tabulated values for sample size code letter H: s‑method
47 24.8 Operating characteristic curves and tabulated values for sample size code letter J: s‑method
48 24.9 Operating characteristic curves and tabulated values for sample size code letter K: s‑method
49 24.10 Operating characteristic curves and tabulated values for sample size code letter L: s‑method
50 24.11 Operating characteristic curves and tabulated values for sample size code letter M: s‑method
51 24.12 Operating characteristic curves and tabulated values for sample size code letter N: s‑method
52 24.13 Operating characteristic curves and tabulated values for sample size code letter P: s‑method
53 24.14 Operating characteristic curves and tabulated values for sample size code letter Q: s‑method
54 24.15 Operating characteristic curves and tabulated values for sample size code letter R: s‑method
55 25 Charts s-D to s-R — Acceptance curves for combined control of double specification limits: s-method
68 Bibliography
70 Annex A (normative) Table for determining the sample size code letter
71 Annex B (normative) Form k for single sampling plans: s-method
74 Annex C (normative) Form k for single sampling plans: σ-method
77 Annex D (normative) Values of f s for maximum sample standard deviation (MSSD)
80 Annex E (normative) Values of fσ for maximum process standard deviation (MPSD)
81 Annex F (normative) Estimating the process fraction nonconforming for sample size 3: s‑method
84 Annex G (normative) Single sampling plans of Form p*
85 Annex H (normative) Values of c U for upper control limit on the sample standard deviation
86 Annex I (normative) Supplementary acceptability constants for qualifying towards reduced inspection
87 Annex J (normative) Procedures for obtaining s and σ
89 Annex K (informative) Consumer’s risk qualities
93 Annex L (informative) Producer’s risks
97 Annex M (informative) Operating characteristics for the σ‑method
101 Annex O (normative) Accommodating measurement variability

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BS ISO 3951-1:2013
$215.11