ISO 18404:2015 is a global standard that outlines the competency specifications of Lean and Six Sigma methods in organizations. It provides a standardized framework for determining the competence and adequacy of individuals and organizations in the execution of process improvement initiatives. It is the duty of a Certified ISO 18404:2015 Lead Auditor to verify if companies are in accordance with these standards, maintaining efficiency as well as regulatory compliance. The function of a Lead Auditor exceeds mere compliance verifications. It entails evaluating an organization\'s performance in incorporating Lean and Six Sigma concepts, which means that such methodologies as value stream mapping, process improvement, and statistical measurements are properly put into practice. This entails ascertaining practitioners\' competencies at different levels, including Lean & Six Sigma Green Belts, Black Belts, and Master Black Belts, so that they live up to competency standards as indicated in ISO 18404 certification. Through meticulous audits, a Lead Auditor determines areas of inefficiencies, gaps, and areas where process improvements can be made. These audits yield important information that enables organizations to optimize their strategies, eliminate waste, improve productivity, and overall quality. It\'s not only compliance, but the encouragement of a culture of continuous improvement based on global best practices.