Six Sigma
Definition
Six Sigma is a data-driven methodology for reducing defects and variation in processes, using statistical tools and the DMAIC improvement cycle. In supply chain, it is applied to problems like forecast error, order accuracy, and lead time variability.
In Practice
Six Sigma originated at Motorola in the 1980s and was popularized by General Electric. Its core idea is that process variation causes defects, and that measuring, analyzing, and controlling variation systematically produces dramatic quality and cost improvements. The DMAIC cycle (Define, Measure, Analyze, Improve, Control) provides the standard project roadmap.
Supply chains are full of variation: supplier lead times fluctuate, forecasts miss, picking errors occur. Six Sigma gives professionals a rigorous toolkit, from process mapping and root cause analysis to statistical process control and hypothesis testing, for attacking these problems with data rather than opinion.
For career purposes, Six Sigma training is delivered through the belt system, and a Green Belt is a common differentiator for analysts and planners. Employers value it because certified practitioners can lead structured improvement projects with measurable savings. Pair it with Lean thinking, since most organizations now blend the two as Lean Six Sigma.
Related Terms
Lean Six Sigma Belts are tiered practitioner levels — typically Yellow, Green, Black, and Master Black Belt — that indicate increasing expertise in leading process improvement projects. Each belt reflects greater training, statistical skill, and project leadership responsibility.
Continuous ImprovementContinuous Improvement is the ongoing, systematic effort to make processes better in small increments rather than through occasional large overhauls. In supply chain, it targets waste, errors, delays, and cost across every process.
KaizenKaizen is a Japanese term meaning change for the better, describing a philosophy of small, continuous improvements made by everyone in an organization. It is a foundational concept of Lean thinking and the Toyota Production System.