Foreword
Section one: General
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Average outgoing quality limit
6 Switching between attributes and variables inspection
7 The credit principle
8 Classification by weight range
9 Role and use of 100% inspection of non-accepted lots
Section two: Choice of sampling plan
10 Choice between attributes and variables
11 Choice between the "s" method and the "sigma" method
12 Choice of constant, c, for sampling by variables
13 Choice of sampling plan
Section three: Operation of a sampling scheme
14 Preliminary operations
15 Standard procedure for sampling by attributes
16 Standard procedure for the "s" method
17 Standard procedure for the "sigma" method
18 Procedure during continuing inspection
19 Normality and outliers
19.1 Normality
19.2 Outliers
20 Records
20.1 Measures of location and variation
20.2 Results of tests for outliers and departure from normality
20.3 Results of tests for heterogeneity and inconsistency of
sample standard deviations
20.4 Significant test results
21 Operation of switching rules
21.1 The start of inspection operations
21.2 Switching to sampling by variables
21.3 Switching from variables inspection to attributes inspection
21.4 Switching between preferred values of c
21.5 Discontinuation of inspection
22 Switching between "s" method and "sigma" method
22.1 Switching from the "s" method to the "sigma" method
22.2 Switching from the "sigma" method to the "s" method
Section four: Tables
Annex A (normative) Procedures for obtaining s and sigma
A.1 Procedure for obtaining s
A.2 Procedure for obtaining sigma
Annex B (normative) Likelihood ratio tests for heterogeneity
and inconsistency of standard deviations
Bibliography