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Acceptance Sampling: Accept or Reject Batches

Acceptance sampling is used by industries worldwide for assuring the quality of incoming and outgoing goods. Acceptance sampling plans determine the sample size and criteria for accepting or rejecting a batch based on the quality of a sample, using statistical principles. Many organizations require the use of ISO standards (or their ISO/ANSI/ASQC/BS/Military Standards or other counterparts) for purposes of certification. Below are online versions of Military Standard Tables (equivalent to the civilian ISO/ANSI/ASQC/BS standards), which greatly simplify the process of determining sampling plans. You can find out how many items to sample and inspect, and how to decide whether the entire batch should be accepted or rejected.

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Calculator What is it for?
MIL-STD-105E (ANSI/ASQ Z1.4)
ISO 2859-1 (BS 6001-1)
Single and double sampling plans for attribute (pass/fail) data
MIL-STD-414
ANSI/ASQC Z1.9, ISO 3951, BS6002
Sampling plans for measurement data
MIL-STD-1235C
Procedure CSP-1
Sampling plans for continuous production
Dodge-Romig Single Sampling AOQL AOQL-based rectifying plan for attribute (pass/fail) data
Dodge-Romig Single Sampling LTPD LTPD-based rectifying plan for attribute (pass/fail) data
MIL-STD-1916 for Attributes Accept-on-Zero (c=0) sampling plans for attribute (pass/fail) data
MIL-STD-1916 for Variables Accept-on-Zero (c=0) sampling plans for measurement data
MIL-STD-1916 for Continuous Sampling Accept-on-Zero (c=0) sampling plans for continuous production
Squeglia Zero-Based Plans AQL-based Accept-on-Zero (c=0) sampling plans for attribute (pass/fail) data
 
Procedure What is it for? Example
MIL-STD-105E Switching Rules (ANSI/ASQC Z1.4)
ISO 2859-1 Switching Rules (BS 6001-1)
Switching rules between levels of inspection "Switch from normal to tightened inspection following 5 consecutive accepted batches"
MIL-STD-1235C Switching Rules
Procedure CSP-1
Switching rules between phases of sampling "Switch from 100% inspection to partial sampling after 5 consecutive  conforming items" 
MIL-STD-1916 Switching Rules Switching rules for batch (attributes and variables) sampling plans Switch from normal to reduced inspection following 10 consecutive non-rejected batches

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Quality is never an accident; it is always the result of high intention, sincere effort, intelligent direction and skillful execution; it represents the wise choice of many alternatives.

— William A. Foster