Six Sigma Belts Explained: White, Yellow, Green, Black & Master Black Belt

5 min read · Updated July 2026

Six Sigma uses coloured "belts" to describe how much training someone has and how big a role they play in improvement work. Here is what each level means in practice — and how to decide which your organisation needs.

The belt levels

• White Belt — awareness of the basics; can support local improvements and understand the language.
• Yellow Belt — takes part in projects as a team member and can run small improvements in their own area.
• Green Belt — leads focused projects part-time alongside their day job; the workhorse of most programmes.
• Black Belt — leads larger, cross-functional projects full-time and coaches Green Belts.
• Master Black Belt — sets strategy, trains and mentors Black Belts, and governs the overall programme.

How the levels build on each other

Each belt adds depth in the DMAIC method and statistical tools. White and Yellow Belts focus on understanding waste and helping locally. Green Belts learn to measure and analyse properly and deliver real savings. Black Belts add advanced analysis, change leadership and coaching.

Which belt does your team need?

For most SMEs, the highest-value move is training a handful of Green Belts and giving everyone else awareness (White/Yellow). You rarely need full-time Black Belts until you are running many projects at once.

A good sequence is: give the whole team awareness so improvement becomes normal, certify 1–3 Green Belts to lead projects, then add a Black Belt only when project volume justifies it.