What Are the Eight Types of Quality Control Services?

September 27, 2023
Quality Control Services by JI Wercs for Fasteners Sorting
Quality Control Services by JI Wercs for Fasteners Sorting

Would you ever cook pasta using tomato ketchup as its sauce? No, because we would not want to offend the Italians. Jokes apart, if you ask any chef or a seasoned cook about this dilemma. They would tell you that the actual reason you would not use tomato ketchup as a substitute for the homemade tomato-based pasta sauce generally preferred is because of the sheer difference in quality and taste that the two offer despite being made from similar ingredients.

Similarly, we live in a world where quality speaks louder than quantity. This shows the importance of quality in a business of any industry that aims to produce high-quality products and services. Simply put, quality control is a meticulous process of ensuring that a company’s products or services meet the desired standards and expectations the market industry sets.

Implementing Quality control protocols is essential because it helps to identify defects, reduce waste, and improve customer satisfaction. As competition grows, the demand for superior quality rises, pushing industries from electronics to pharmaceuticals and food to machinery to lean heavily on quality control to maintain their reputation and customer trust.

If you are wondering about the different quality control techniques and checks that make up Quality Control and risk management, read on as we discuss and explain the seven types of quality control commonly used in industries worldwide.

I. Statistical Quality Control (SQC)

Statistical quality control (SQC) systems are a set of principles and techniques used to monitor and control the quality of products and processes. SQC uses statistical tools and methods to analyze data and identify trends and patterns. The key tools and techniques used in SQC include control charts, histograms, Pareto charts, and scatter diagrams. SQC has several benefits, including improved product quality, reduced waste, and increased customer satisfaction. SQC is widely used in manufacturing, healthcare, and finance.’

II. Total Quality Control (TQC)

Total quality control (TQC) is an effective quality control service to quality management that involves all employees in an organization. TQC focuses on what customers want and expect so it can improve the quality of products and services. The fundamental principles and elements of TQC include customer focus, continuous improvement, employee involvement, and process management. TQC is integrated into the organizational culture and processes and requires a long-term commitment from the organization’s leadership.

III. Six Sigma

Using the Six Sigma technique, product and process quality may be improved by lowering faults and decreasing process variability. The DMAIC process, which entails defining the issue, measuring the process, interpreting the data, improving the process, and controlling the process, is the foundation of the Six Sigma methodology. Six Sigma significantly emphasizes statistical analysis to find and minimize process deviations. Six Sigma is widely used in manufacturing, healthcare, and finance industries.

IV. Lean Manufacturing

Lean manufacturing is a collection of standards and techniques to streamline production processes and cut waste. By removing non-value-added tasks, lean manufacturing focuses on continual improvement and waste reduction. Lean manufacturing principles include value, flow, pull, and perfection. Lean manufacturing is closely related to quality control because it aims to improve the quality of products by reducing waste and improving efficiency.

V. Quality Assurance (QA)

To make sure that goods and services adhere to the intended quality standards, a variety of procedures and approaches are employed in quality assurance (QA). QA is distinct from quality control in that it emphasizes avoiding errors rather than finding and fixing them. QA involves using processes and methodologies such as ISO 9000, Six Sigma, and TQM (Total Quality Management) to ensure quality standards and regulations compliance.

VI. Inspection and Testing

Inspection and testing are essential elements of quality control services since they aid in discovering flaws and guarantee that goods adhere to the specified standards of quality. Inspection involves the visual examination of products to identify defects. In contrast, testing involves using various methods to test the products’ functionality and performance. Different types of inspections include visual, dimensional, and functional inspections, while testing methods include destructive and non-destructive testing.

VII. Supplier Quality Control

Supplier quality control is a critical aspect of quality control in the supply chain. It involves evaluating and selecting reliable suppliers and implementing quality control measures for incoming materials and components. Supplier quality control is essential because it helps to ensure that the products produced by an organization meet the desired quality standards.

VIII. Process Control

Process control involves monitoring and controlling critical processes to ensure quality. Process control consists of using statistical process control (SPC) techniques to monitor and control the quality of products and processes. SPC uses control charts, histograms, and other statistical tools to identify and correct process variations. Continual process improvement is essential for enhanced quality control.


In conclusion, we have understood how Quality control is very important for industries aiming to produce top-notch products and services. There are seven primary methods: Statistical Quality Control (SQC), Total Quality Control (TQC), Six Sigma, Lean Manufacturing, Quality Assurance (QA), Inspection and Testing, Supplier Quality Control, and Process Control. Each method offers its unique benefits, and the selection should align with specific industry and organizational requirements.

SQC uses statistical techniques for quality measurement, TQC involves all organizational members, and Six Sigma focuses on defect reduction. Lean Manufacturing aims at waste minimization, QA ensures standard adherence, Inspection, and testing detects defects, Supplier Quality Control oversees supplier material quality, and Process Control utilizes statistics to manage process inputs.

With so many options to choose from, selecting the right quality control approach for your company or industry will bring you the best results. For instance, a company in the food industry might rely on SQC for premium goods. At the same time, laboratories would employ it for consistent product quality. Therefore, we recommend using suitable methods to guarantee your products and services surpass customer expectations, improving satisfaction and profitability.



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