1 Scope
This Part specifies generic skip-lot sampling procedures for acceptance inspection by attributes. The purpose of these procedures is to provide a way of reducing the inspection effort on products of high quality submitted by a supplier who has a satisfactory quality assurance system and effective quality controls. The reduction in inspection effort is achieved by determining at random, with a specified probability, whether a lot presented for inspection will be accepted without inspection. These procedures extend the principle of the random selection of sample items already applied in GB/T 2828.1 to the random selection of lots.
The skip-lot sampling procedures specified in this part are applicable to, but not limited to, inspection of
a) End items, such as complete products or sub-assemblies,
b) Components and raw materials, and
c) Materials in process.
2 Normative references
The following normative document contains provisions which, through reference in this text, constitute provisions of this Part. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
Contents
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 General requirements
5 Supplier and product qualification
5.1 Supplier qualification
5.2 Product qualification
5.3 Qualification score
5.4 Example for product qualification
6 Skip-lot sampling procedures
6.1 General
6.2 Initial inspection frequency and its determination
6.3 Inspection frequency and shifting
6.4 Sampling plans, lot selection and inspection procedures (States 2 and 3)
6.5 Skip-lot interruption
6.6 Requalification
6.7 Product disqualification
6.8 Supplier disqualification and suspension
7 Supplier responsibilities
8 Inspection agency and responsible authority responsibilities
8.1 General
8.2 Responsibilities on supplier qualification
8.3 Other responsibilities
9 Compatibility with GB/T
9.1 Limitations
9.2 Relation to reduced inspection
10 Additional information
10.1 Design basis
10.2 Statistical characteristics of the skip-lot procedures
Appendix A (normative) Optional requirements to be agreed prior to product qualification
Appendix B(normative) Procedures for random selection at specified inspection frequency
Appendix C (informative) Factors used in deciding between skip-lot inspection and reduced inspection
Bibliography
