Quality Control and Assurance

The primary objective of quality control is to ensure that products meet customer requirements. This is done by inspecting products and ensuring that they conform to the specifications set by the customer.

Quality control is focused on preventing defects from occurring in the first place, while quality assurance is focused on detecting defects that have already occurred. Quality control is typically carried out by inspectors, while quality assurance is typically carried out by auditors.

The three main types of quality control are inspection, testing, and measurement; statistical process control, acceptance sampling, and design of experiments; and gage repeatability and reproducibility, process capability, and measurement system analysis.

The purpose of inspection is to detect defects in products. This is done by visually examining products, using measuring instruments, or conducting tests.

The purpose of testing is to evaluate the quality of products. This is done by conducting tests to determine whether products meet the specifications set by the customer.

The purpose of measurement is to determine the dimensions of products. This is done using measuring instruments, such as rulers, calipers, and micrometers.

Statistical process control is a method for controlling the quality of a process by monitoring and adjusting the process parameters.

Acceptance sampling is a method for detecting defects in products by inspecting a sample of products.

Design of experiments is a method for improving product quality by identifying the factors that affect product quality and optimizing those factors.

Gage repeatability and reproducibility is a measure of the accuracy, precision, and reliability of a measuring instrument.

Process capability is the ability of a process to produce products that meet customer requirements, are free of defects, and are consistent in quality.

Measurement system analysis is a method for evaluating the accuracy, precision, and reliability of a measuring instrument.

Quality control is focused on the final product, while quality assurance is focused on the entire production process. Quality control is focused on internal processes, while quality assurance is focused on external processes. Quality control is focused on short-term goals, while quality assurance is focused on long-term goals.

The three main types of quality control are inspection, testing, and measurement; statistical process control, acceptance sampling, and design of experiments; and gage repeatability and reproducibility, process capability, and measurement system analysis.

The purpose of inspection is to detect defects in products. This is done by visually examining products, using measuring instruments, or conducting tests.