What is the four stage of quality?

1. Prevention: This is the most important stage of quality, as it is the key to eliminating defects before they can occur. Prevention activities include training, process design, and quality control.

2. Detection: If a defect does occur, it is important to be able to detect it as early as possible, so that it can be removed from the product. Detection activities include inspection, testing, and feedback from customers.

3. Correction: If a defect is found, it must be corrected. This may involve repairing or replacing the defective product, or implementing a new process to prevent the defect from occurring again.

4. Evaluation: It is important to evaluate the effectiveness of your quality control program to ensure that it is meeting your objectives. This may involve conducting audits, surveys, and customer satisfaction studies.