Error-proofing, also known as "poka-yoke," is a quality management technique aimed at preventing mistakes before they occur. Effective error-proofing not only minimizes defects but also reduces costs, enhances productivity, and improves safety. To comply with ISO standards, such as ISO 9001, ISO 45001, or ISO 22000, the error-proofing process must be integrated systematically into a quality management system (QMS) or safety management system (SMS). This article covers a step-by-step approach to establishing an ISO-compliant error-proofing process.