Six Sigma complements ISO compliance in several ways. Both Six Sigma and ISO standards emphasise the importance of quality improvement. Six Sigma provides tools and methodologies to identify and address root causes of defects, helping organisations meet ISO requirements for continuous improvement. Six Sigma relies heavily on data and statistical analysis to identify variations and defects. This aligns with ISO's emphasis on evidence-based decision-making and process control. The DMAIC methodology of Six Sigma provides a structured approach to problem-solving and process improvement, which can be applied to address non-conformities identified during ISO audits. ISO standards, including ISO 9001, emphasise meeting customer requirements and enhancing customer satisfaction. Six Sigma's focus on process improvement ultimately leads to better products and services, meeting customer expectations and aligning with ISO's customer-focused objectives. ISO standards often require organisations to assess and manage risks to quality and other aspects of their operations. Six Sigma tools such as Failure Mode and Effects Analysis (FMEA) can help identify and mitigate risks, aiding in ISO compliance. By integrating Six Sigma methodologies into their quality management systems, organisations can enhance their ability to meet ISO requirements, drive continuous improvement, and ultimately deliver greater value to their customers.