Committees responsible
National foreword
Guide
Section 1. General
1.1 Scope
1.2 Normative references
1.3 Definitions
Section 2. General introduction to acceptance sampling
2.1 Aim of sampling inspection
2.2 Acceptance sampling
2.3 Choosing between attributes and variables
inspection
2.4 Lot inspection
2.5 Sequence or isolated lot inspection
2.6 Acceptable quality level (AQL)
2.7 Process average
2.8 Limiting quality (LQ)
2.9 Normal and tightened inspection
2.10 Reduced inspection
2.11 Switching rules
2.12 Average outgoing quality (AOQ) and its limit
(AOQL)
2.13 Item; unit of product
2.14 Nonconformity and nonconforming item
2.15 Critical nonconformities
2.16 Curtailment of inspection
2.17 Disposal of unacceptable lots
2.18 Single sampling
2.19 Operating characteristic (OC) curves
2.20 Double sampling
2.21 Multiple sampling
2.22 Sequential sampling
2.23 Skip-lot sampling
2.24 Comparison of single, double, multiple and
sequential sampling
2.25 Drawing of samples
2.26 Sampling plans, schemes and systems
2.27 Distributional characteristics (binomial,
Poisson and hypergeometric)
Section 3. The ISO 2859-1 system
3.1 Description of ISO 2859-1
3.2 Preparing a specification for use in conjunction
with ISO 2859-1
3.3 Classification of nonconformities and
non-conforming ideas
3.4 Lots
3.5 Meaning of inspection level
3.6 Setting an inspection level
3.7 Preferred AQLs
3.8 Non-preferred AQLs
3.9 Setting an AQL
3.10 Drawing a sampling plan from the tables in
ISO 2859-1
3.11 Normal inspection
3.12 Tightened inspection
3.13 Switching rules - Example
3.14 Methods for reducing the sampling risks
3.15 Reduced inspection
3.16 Double and multiple sampling
3.17 Limiting quality and the isolated lot
3.18 Sample sizes
3.19 Operating characteristic curves
3.20 The AOQL table
3.21 Nomograms
Tables
1 Multiple sampling plan for code letter L and an
AQL of 0.65%
2 Equivalent sampling plans for code letter L
and an AQL of 0.65%
3 Random sampling numbers
4 Sampling 20 lots from a hypothetical inspection
process, inspection level III
5 Relationship between sample size and lot size
for the three general inspection levels
6 Summary table of ISO 2859-1 sampling plans for
normal and tightened inspection
7 Percentage of lots expected to be accepted if
quality is equal to AQL, single sampling, normal
inspection
8 Twenty-five lots from a hypothetical inspection
process
9 Fifteen lots from a hypothetical inspection
process
10 Ten lots from a hypothetical inspection process
Figures
1 AOQ and its limit AOQL
2 Operating characteristic curve of a single
sampling plan with sample size 200 and acceptance
number 7
3 Operation of the curtailed sequential sampling
plan of ISO 8422 corresponding to an AQL of 0.65%
sample size code letter L
4 Comparison of operating characteristic curves for
single, double, multiple and sequential sampling
plans (code letter L,AQL = 0.65%)
5 Comparison of average sample sizes for single,
double, multiple and sequential sampling
6 Comparison of OC curves for determining
inspection level (AQL of 1% nonconforming normal
inspection)
7 The ideal, but unattainable, OC curve
8 OC curve of a sampling plan designed to give a
high probability of non-acceptance if any lot
having a quality worse than the AQL is submitted
9 OC curve of a sampling plan designed to give
a high probability of acceptance if any lot
having a quality better than the AQL is
submitted
10 OC curves for two 'normal inspection' sampling
plans for an AQL of 1.0% nonconforming
11 Four sampling plans for an AQL of 1,5% non-
conforming, normal inspection, single sampling
12 Nomogram for type of sampling, code letter and
sample size in ISO 2859-1
13 Nomogram for AQL, sample size and acceptance
number in ISO 2859-1