Quality at the source means that each employee is held responsible for ensuring the quality of products. This is accomplished with the following tools:
Mistake proofing. Delve into the causes of poor quality and correct the underlying issues, so that they do not occur again.
Self checks. Allow workers to measure the specifications of their work, and call for help if units are out of spec.
Standardized work. Use a high level of documentation and training to ensure that each product is manufactured the same way, every time.
Successive checks. Each successive workstation checks the quality of the incoming work.
Visual management. Use a signaling system to pull engineers and managers to the spot where there is a problem, so that it can be corrected at once.