Average Outgoing Quality AOQ - Sampling Technique - Metrology and Quality Engineering | Summary and Q&A

TL;DR

Average outgoing quality (AOQ) is a method for evaluating sampling plans, calculated by multiplying the probability of acceptance (PA) and the percent defective (P'). The shape of the AOQ curve depends on what is done with the unaccepted lot.

Key Insights

• 🌱 AOQ is a method for evaluating sampling plans in quality control.
• ✖️ The AOQ is calculated by multiplying the probability of acceptance and the percent defective.
• 🧑‍✈️ The shape of the AOQ curve depends on what is done with the unaccepted lot.
• 🤙 If the unaccepted lot is subject to 100% inspection and defects are replaced, it is called an acceptance rectification plan.
• 📲 The AOQ is always better than the incoming quality due to the rectification process.
• ⛔ The maximum value of AOQ is known as the average outgoing quality limit.
• ❓ The AOQ curve is drawn against the probability of acceptance and assumed process quality.

Transcript

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Questions & Answers

Q: What is average outgoing quality (AOQ)?

AOQ is a method used to evaluate sampling plans in quality control. It is calculated by multiplying the probability of acceptance (PA) and the percent defective (P').

Q: How is the AOQ curve determined?

The shape of the AOQ curve is determined by what is done with the unaccepted lot. If the lot is subject to 100% inspection and defective pieces are replaced with good pieces, it is called an acceptance rectification plan.

Q: Is the AOQ always better than the incoming quality?

Yes, the AOQ is always better than the incoming quality because rejected lots are rectified by screening. This means that any defects are replaced with good pieces before returning a 100% good lot.

Q: How is the average outgoing quality limit determined?

The average outgoing quality limit is the maximum value of AOQ. It is determined by the shape of the AOQ curve when the lots are considered for screening or rectification.

Summary & Key Takeaways

• Average outgoing quality (AOQ) is a method used to evaluate sampling plans in quality control.

• The AOQ is calculated by multiplying the probability of acceptance (PA) and the percent defective (P').

• The shape of the AOQ curve is determined by the actions taken with the unaccepted lot.