ASQ - American Society for Quality
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| ASQ Z1.4 |
| Sampling Procedures and Tables for Inspection by Attributes |
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ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes
SCOPE
This publication establishes sampling plans and procedures for inspection by attributes. When specified by the responsible authority, this publication shall be referenced in the specification, contract, inspection instructions, or other documents and the provisions set forth herein shall govern. The "responsible authority" shall be designated in one of the above documents, as agreed to by the purchaser and seller or producer and user.
APPLICATION
Sampling plans designated in this publication are applicable, but not limited, to inspection of the following:
- a. End items.
- b. Components and raw materials.
- c. Operations.
- d. Materials in process.
- e. Supplies in storage.
- f. Maintenance operations.
- g. Data or records.
- h. Administrative procedures.
These plans are intended primarily to be used for a continuing series of lots or batches. The plans may also be used for the inspection of isolated lots or batches, but, in this latter case, the user is cautioned to consult the operating characteristic curves to find a plan which will yield the desired protection (see l l .6).
INSPECTION
Inspection is the process of measuring, examining, testing, or otherwise comparing the unit of product (see 1.5) with the requirements.
INSPECTION BY ATTRIBUTES
Inspection by attributes is inspection whereby either the unit of product is classified simply as conforming or nonconforming, or the number of nonconformities in the unit of products is counted, with respect to a given requirement or set of requirements.
UNIT OF PRODUCT
The unit of product is the unit inspected in order to determine its classification as conforming or nonconforming or to count the number of nonconformities. It may be a single article, a pair, a set, a length, an area, an operation, a volume, a component of an end product, or the end product itself. The unit of product may or may not be the same as the unit of purchase, supply, production, or shipment.