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Sampling vs. traditional inspection -Which is the best?

Every corporation dedicated to manufacturing products needs to test the quality before putting them on the market. Thus, they must decide between sampling vs. traditional inspections.

To choose between both procedures, they must first assess the pros and cons of sampling inspection in business and the benefits of conventional inspection methods.

Comparison between sampling vs. traditional inspections

The main difference between sampling vs. traditional inspections is that the first checks only a representative percentage of the totality of the products, while the second reviews 100% of the products that will go on the market.

Sampling vs. traditional inspections

Sampling is the process that measures the quality of a random percentage of the products in a company so that they meet the requirements specified by quality control companies or customers.

On the contrary, the traditional inspection is based on the same premise as the quality inspection by sampling but inspecting 100% of the products.

Approaches and methodologies in Sampling vs. traditional inspections

There are several approaches to performing quality checks. Three of them will be described in this article:

  1. Six Sigma. This system focuses on problem-solving. Its goal is reducing defects and managing the required variations according to what the internal specifications establish. It is used in total inspection. The methodologies that this approach uses are:
  • DMAIC. His initials refer to Defining, Measuring, Analyzing, Improving, and Controlling everything related to the manufactured product and the standards required for it to be of “Six Sigma Quality.”
  • DMADV. In this case, the first three initials refer to the same concepts as the previous one, and the last two are Design and Verify. Both seek to obtain “Six Sigma Quality.”

2. Read. This approach’s goal is to eliminate waste generated in the manufacturing process; in this way, it improves overall efficiency. It is used in sampling inspection.

Residues refer to processes or fixes that are not considered necessary in logical analysis and, therefore, should be eliminated. The methodologies used by Lean are:

  • 5S. This methodology is focused on ensuring that the entire sector of the company in charge of the elaboration of the products is optimal through Classifying, Putting in Order, Shining, Standardizing, and Maintaining.
  • PDCA. Its acronym in English of the words Plan, Do, Check, and Act. Focuses on problem-solving.

3. Kaizen. This approach seeks the participation of all sectors of the company. That is, from high-ranking managers to employees on the assembly line.

By involving everyone, improvements are constantly made, even small ones. It is used in total inspection. These are their methodologies:

  • SIPOC. It is a mapping instrument that refers to Suppliers, Inputs, Processes, Outputs, and Customers by its acronym in English. This instrument guarantees the clarity of the procedures.
  • Walk through the Gemba. It is a regular inspection carried out by the executives of the company to the place where the products are manufactured and to talk with their workers about the improvements.
  • Report 8D. It focuses on solving problems by containing, resolving, or preventing them.

It is essential to clarify that Six Sigma and Lean are often combined for better results. This combination is known as Lean Six Sigma.

On the other hand, Kaizen is a component of the Lean approach. The most successful companies, such as Toyota and Motorola, use these procedures.

Advantages and disadvantages of each approach based on business needs

Each company will apply the system that best suits it according to the product type to manufacture. Every manufacturing company is regulated by specific rules so that their products can be marketed. Therefore, the method that best guarantees the improvement of production processes according to the company’s specific regulations will be used.

Benefits of Sampling vs. traditional inspections in businesses

Quality draw: a cost-effective quality control method. It is thanks to all the benefits it provides, among which are:

  • Helps to improve the quality of products and their manufacturing processes.
  • It allows the increase of the economic profitability of the businesses. By performing inspections of all manufacturing procedures, defects will be avoided. Consequently, there will be no errors in batches either. Therefore, only the amount of money necessary for production will be invested.
  • It will increase credibility and competitiveness. When recognized quality raffles have validated your business’s products, customers will feel confident purchasing and recommending them.
  • Processes are innovative and improve performance. A quality sorter who is a specialist will use Industry 4.0. Therefore, it will always be at the forefront of today’s market, innovating procedures and increasing performance.

In this way, your company will obtain guaranteed growth by offering certified quality products.

Advantages of traditional inspection methods

The advantages of traditional inspection methods are multiple. It is a method carried out for centuries to meet the product quality required.

The traditional inspection method requires longer because all the manufactured objects must be checked. However, it guarantees that none will be marketed with defects.

Considerations when choosing the right quality control approach for your business

Based on the analysis that you carry out on the objectives to be met in the company and the demands of your clients, you will select the appropriate quality control approach for your company.

Evaluation of the efficiency of the sampling in your business

The review of the efficiency of the  sampling in your company will be made taking into account the following:

  • If it significantly reduces the time of the verification of the quality of the product.
  • Whether verification is performed during manufacturing procedures.
  • If you improve those processes.
  • If the costs of quality verification procedures are reduced.
  • If the products are not returned due to manufacturing defects.

And any other element that provides extensive and minor improvements to the company and its collaborators. A good, quality sorter will give you all those benefits.

Comparison of quality results in the sampling vs. traditional inspections

The results that will be obtained using the sampling inspection will be based on the verification of defects or problems from the beginning of the manufacturing procedures of each product. In addition, it performs them in batches and in a faster and more precise way. Consequently, they will require less time, cost and will not present errors.

In the case of traditional inspection, errors could occur in the final review, which appeared in the manufacturing process. It requires more time. Therefore, the costs are higher.

Frequently Asked Questions about Sampling vs. traditional inspections

What is the difference between 100% inspection and sampling inspection?

When we talk about 100% inspection, we are referring to quality control that is carried out piece by piece, individually. Each part of the product must be verified in detail. In the case of inspection by sampling, a batch of products is inspected, and only a representative sample of them is confirmed.

What are the three types of quality inspection?

The types of quality inspection are carried out in three different ways: sampling, attributes, and variables.

Decide the best method for your company between the quality draw and traditional inspection.

 With all the details described in this article about quality vs. traditional inspection, you can consciously choose the best method. It would be best if you remembered that offering products that have proven quality will give your customers greater confidence. On the other hand, you will avoid recurring returns.

If you want to hire a company dedicated to these quality verification services, contact AMN Quality Solutions. You can contact or visit us at our offices in Ciudad Juárez, Querétaro, or El Paso. You will get personalized attention, and we will offer you the best plans. Do not forget to go with the experts in the area!

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