Acceptance Sampling
Quality Management Case Study

Objectives
• Definition of Acceptance Sampling.
• Purposes of Acceptance Sampling.
• Acceptance Sampling method.
• When is Acceptance Sampling useful.
• Advantages of Acceptance Sampling.
• Disadvantages of Acceptance Sampling
• Different types of Acceptance sampling.
• Different Acceptance Sampling plans.
• Error types.
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Definition
What is Acceptance Sampling ?

• Statistical quality control (SQC) technique.
• Developed by Dodge and Romig during world war two.

• The lot is either accepted or rejected based on random sample. Accept lot = Ready for customers.
Reject lot = Not suitable for customers.
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Purposes
What are the purposes of acceptance sampling?

• Determining the quality of shipped items.
• Determining the quality of items at end of production.
• Ensuring quality conforms with predetermined standards.

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Methodology
How to use Acceptance Sampling?

• Determine the sample size (n) from a lot (N), based on the lot size and characteristic inspected.

• Determine maximum number of acceptable defectives (c), to determine whether the lot is accepted or rejected, based on the information available.

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Flow Chart

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When is it useful?
Acceptance Sampling is useful when the inspection method used is:
• Expensive.
• Destructive.
• Time consuming
• When developing new products.
• When dealing with a new supplier.
• When the current supplier is in question.
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Advantages
What are the Advantages of Acceptance Sampling ?

• Less handling damages.
• Fewer inspectors needed.
• Reduce amount of inspection error.
• 100% inspection is too expensive.
• 100% inspection is time consuming.

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Disadvantages
What are the disadvantages of Acceptance sampling?

• Does not ensure the quality of the