Warning limits serve as early detection mechanisms in Six Sigma’s Control Phase, positioned at two standard deviations from the process mean. Understanding their proper application helps organizations maintain quality improvements and prevent minor process deviations from escalating into major problems.

Effective procurement operations require systematic approaches to identifying and resolving supplier performance and lead time issues. This comprehensive guide explores practical methods for measuring supplier performance, analyzing lead time variations, and implementing corrective strategies that enhance supply chain reliability and organizational competitiveness.