ICS 03.120.30                         MSD 03

Reaffirmed 2021

NATIONAL FOREWORD

This Indian Standard (Part 3) which is identical with ISO 3951-3 : 2007 ‘Sampling procedures for inspection by variables — Part 3: Double sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Statistical Methods for Quality and Reliability Sectional Committee and approval of the Management and Systems Division Council.

This standard is published in five parts under the general title ‘Sampling procedures for inspection by variables’. Other parts in this series are:

Part 1 Specification for single sampling plans indexed by acceptance quality limit (AQL) for lotby- lot inspection for a single quality characteristic and a single AQL

Part 2 General specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics

Part 4 Procedures for assessment of declared quality levels

Part 5 Sequential sampling plans indexed by acceptance quality limit (AQL) for inspection by variables (known standard deviation)

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.