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What are the most common sampling plans for quality control?

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Sampling plans are methods of selecting a subset of items or units from a population or a lot for quality inspection. They help you determine how many samples you need to check, what criteria you should use to accept or reject the lot, and what level of confidence you can have in your decision. In this article, you will learn about the most common sampling plans for quality control, their advantages and disadvantages, and how to choose the best one for your situation.

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Govind Tiwari,PhD

Quality Leader | 21 Years in Oil, Gas & Energy Industry | Quality, HSE & Risk Management Expert | Driving and…
Noman Siddiqui

Manager service Customer

1 Single sampling plan

A single sampling plan is the simplest type of sampling plan. It involves taking a fixed number of samples from a lot and inspecting them for defects. Based on the number of defects found, you decide whether to accept or reject the lot. The advantage of this plan is that it is easy to implement and requires minimal resources. The disadvantage is that it may not be very efficient or reliable, especially if the lot size or the defect rate is large.

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Govind Tiwari,PhD

Quality Leader | 21 Years in Oil, Gas & Energy Industry | Quality, HSE & Risk Management Expert | Driving and Advocating QHSE in Business |
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First let's break down this single sampling plan! It's like picking a handful of items from a batch and checking them for problems. Depending on how many issues you find, you decide if the whole batch gets a thumbs up or down. Easy to set up, doesn't need a ton of resources, which is a win. But, here's the catch – it might not be the best choice if you're dealing with a huge batch or a lot of defects. It's a quick and simple method, but it has its limits, especially with big batches or high defect rates.

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2 Double sampling plan

A double sampling plan is a variation of the single sampling plan. It involves taking a first sample of a certain size from a lot and inspecting it for defects. If the number of defects is below a lower limit, you accept the lot. If it is above an upper limit, you reject the lot. If it is between the two limits, you take a second sample of the same size and inspect it for defects. You then combine the results of the two samples and make a decision based on a revised limit. The advantage of this plan is that it can reduce the number of samples needed and increase the accuracy of the decision. The disadvantage is that it may require more time and effort than a single sampling plan.

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3 Multiple sampling plan

A multiple sampling plan is an extension of the double sampling plan. It involves taking a series of samples from a lot and inspecting them for defects. After each sample, you compare the number of defects with a set of limits and decide whether to accept, reject, or continue sampling. The advantage of this plan is that it can further reduce the number of samples needed and increase the precision of the decision. The disadvantage is that it may involve more complex calculations and procedures than a double sampling plan.

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4 Sequential sampling plan

A sequential sampling plan is a special type of multiple sampling plan. It involves taking one sample at a time from a lot and inspecting it for defects. After each sample, you plot the cumulative number of defects on a graph and compare it with two curves: one for acceptance and one for rejection. If the curve falls below the acceptance curve, you accept the lot. If it falls above the rejection curve, you reject the lot. If it falls between the two curves, you continue sampling. The advantage of this plan is that it can minimize the number of samples needed and maximize the sensitivity of the decision. The disadvantage is that it may require more skill and equipment to perform and interpret the graph.

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5 Attribute sampling plan

An attribute sampling plan is a sampling plan that classifies each item or unit in a sample as either defective or non-defective based on one or more quality characteristics. For example, you may inspect a sample of pens for color, ink flow, and tip condition and label each pen as either good or bad. The advantage of this plan is that it is simple and objective to apply and analyze. The disadvantage is that it does not measure the degree or severity of the defects.

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Noman Siddiqui

Manager service Customer
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I think most common sampling method is random sampling plan like you check the product randomly for 3 or more times if the problem deducted just check the whole lot or whatever the product

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6 Variable sampling plan

A variable sampling plan is a sampling plan that measures the actual value or magnitude of a quality characteristic in each item or unit in a sample. For example, you may measure the weight, length, or diameter of a sample of screws and compare them with a specification limit. The advantage of this plan is that it can provide more information and accuracy than an attribute sampling plan. The disadvantage is that it may require more time, equipment, and expertise to perform and analyze.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the most common sampling plans for quality control?

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1 Single sampling plan

2 Double sampling plan

3 Multiple sampling plan

4 Sequential sampling plan

5 Attribute sampling plan

6 Variable sampling plan

7 Here’s what else to consider

Quality Management

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What are the most common sampling plans for quality control?

1

2

3

4

5

6

7

1 Single sampling plan

2 Double sampling plan

3 Multiple sampling plan

4 Sequential sampling plan

5 Attribute sampling plan

6 Variable sampling plan

7 Here’s what else to consider

Quality Management

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