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Quality Control

Quality control is a central aspect in many manufacturing and service companies. It includes measures and procedures for checking and ensuring the quality of products or services. The goal is to increase customer satisfaction and reduce costs by early detection and correction of defects. This glossary entry explains the various methods and techniques of quality control, as well as their practical application and significance in daily business operations.


Quality control is an important part of quality assurance in companies. It allows for the monitoring and evaluation of products and services to ensure their quality and to guarantee compliance with standards and norms. Quality control is crucial for customer satisfaction, competitiveness, and the economic success of a company.

Methods and Techniques of Quality Control

There are various methods and techniques of quality control to verify and ensure the quality of products or services.

1. Inspection

Inspection is the simplest and most commonly used method of quality control. It involves examining products or services for defects or deviations from predefined standards through observation or testing. Inspections can be visual, tactile, acoustic, or through measurements and tests. They can be carried out during the production process (in-process inspection) or after its completion (final inspection).

2. Sampling Inspection

In sampling inspection, a representative selection of products or services from a larger quantity is checked to draw conclusions about the overall quality. This procedure is particularly useful for large production volumes and continuous processes, as it is more economical and faster than a complete check of all products.

3. Test Planning and Test Equipment Monitoring

Test planning determines which inspections should be carried out as part of quality control, how often they should occur, and which testing tools and methods are to be used. Test equipment monitoring ensures that the testing tools used are functioning correctly and are calibrated to ensure accurate and reliable measurement results.

4. Statistical Process Control (SPC)

Statistical process control is a method for systematic monitoring and controlling of production processes based on statistical data and analysis. It enables early detection of quality issues and process deviations, so that corrective actions can be initiated in a timely manner.

5. Failure Mode and Effects Analysis (FMEA)

FMEA is a systematic and preventive method for identifying, assessing, and prioritizing potential sources of error and risks in products or processes. It serves to prevent errors early and to continuously improve quality.

Practical Application and Significance of Quality Control

Quality control plays an important role in many areas of the economy. In manufacturing, it ensures that products meet the required quality standards and satisfy customer requirements. In the service sector, it helps to guarantee the quality of services provided and to increase customer satisfaction.Quality control is also a central element in quality management systems, such as ISO 9001. Through continuous monitoring and improvement of quality, companies can strengthen their competitiveness and expand their market position.An effective quality control system offers numerous advantages for companies:

  • Increased customer satisfaction and loyalty
  • Reduction of defects, scrap, and rework
  • Improvement of process stability and efficiency
  • Compliance with legal requirements and norms
  • Increase in employee motivation through transparent and understandable quality standards
  • Outlook and Trends in Quality Control

    Quality control is continuously evolving to meet increasing demands for quality and efficiency. Digital technologies, such as artificial intelligence, machine learning, and big data, offer new opportunities for the capture, analysis, and control of quality data. Automated inspection systems, such as image processing systems, enable fast and precise quality control in real-time.The networking of production facilities and testing equipment within the context of Industry 4.0 also offers opportunities to make quality control more efficient and effective. By integrating quality control systems into the digital business environment, companies can better incorporate their quality assurance into their business processes and continuously optimize them.