Webstore

RS CXG 50: 2004
General guidelines on sampling

Abstract

In these guidelines, the focus is on acceptance sampling plans for the inspection of isolated homogeneous
lots, in which the risks to consumers and producers are controlled. Additionally, there are some guidelines for
sampling inhomogeneous lots.
The term ‘isolated’ means that the inspection of each lot is done in isolation, without considering the outcome
of the inspection of adjacent lots or, for example, other lots from the same producer. This does not mean that
information from previous inspections cannot be used; in particular, there are cases where the lot standard
deviation may be known from the inspection of previous lots.
The following situations are covered:
? acceptance sampling plans for the control of the percentage nonconforming for homogeneous lots by
attributes or by variables, for goods in bulk or individual items;
? inspection by variables sampling plans for normally distributed characteristics;
? adjustment for measurement uncertainty in cases where it is non-negligible as compared to the lot
standard deviation with a focus on cases where the measurement uncertainty is normally distributed;
? sampling plans for the control of the average content; and
? in addition, some information is provided on issues involved with the design of plans for bulk materials.
In Section 2, general concepts which are relevant for the sampling of foods are defined, Sections 3, 4 and 5
cover acceptance sampling plans for different situations of statistical food control. Section 6 covers other
matters such as physical sampling and inhomogeneous lots.

General Information