Acceptance sampling is a form of inspection applied to lots of items before or after a process to determine if the lot satisfies predetermined standards. Large numbers of items processed in short times and low costs of passing defectives make acceptance sampling suitable. A sampling plan specifies the lot size, sample size, number of samples, and acceptance/rejection criteria to decide if a lot passes standards or is rejected. Single sampling takes one random sample per lot, while double sampling allows two samples if the first is inconclusive.

1. Acceptance sampling

2.  Form of inspection applied to lots of items either
before or after a process instead of during the
process.
 Purpose is to decide whether a lot satisfies
predetermined standards.
 Lots that satisfy these standards are passed or
accepted and others rejected.
 Conditions: Large no. of items processed in a short time
 Cost consequences of passing defectives are low
 Destructive testing is required
 Fatigue & boredom caused by inspecting large no
of items leads to inspection errors

3.  Can be applied to both attribute and variable
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inspection.
Sampling Plan- specify the lot size, sample
size, no. of samples to be taken and
acceptance/rejection criteria.
Single sampling plan-one random sample drawn
from each lot
Every item in sample is examined and said to be
good/defective.
Lot is rejected if sample defectives>specified.

4. Double Sampling Plan