What function does an Error Proofing "control" perform?

The function of an Error Proofing "control" is to prevent a failure from proceeding until the issue has been corrected. This approach is fundamental in quality control and process improvement, particularly within the Lean Six Sigma framework embraced by organizations such as the USAF.

Error proofing, often referred to as "poka-yoke," is designed to eliminate errors by ensuring that the process cannot move forward until all aspects meet predefined standards or criteria. This preventative mechanism not only safeguards against defects but also enhances overall process reliability and quality. By stopping the process to correct any identified issues, it minimizes the likelihood of defects reaching the next stage of production or the final customer, thus contributing to a more efficient and effective operational flow.

In contrast, signals that allow work to continue despite errors or shut down the entire process upon detecting an abnormality serve different purposes and are not focused on the immediate correction of the issue to prevent failure, which is the core function of the error-proofing control.