I.S. CEN TR 14547:2006

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

Describes an acceptance sampling system of single sampling plans both for inspection by attributes and for inspection by variables. The attributes plans are of the accept zero form, i.e. no lot is accepted if the sample from it contains one or more nonconforming articles.