Business Analyst: What is Six Sigma methodology?

Six Sigma — data-driven process improvement.

Goal: Reduce defects to 3.4 per million.

DMAIC cycle:

1. Define — problem statement.
2. Measure — current performance.
3. Analyze — root causes.
4. Improve — implement solutions.
5. Control — sustain gains.

Example:

Belt levels:

• White/Yellow — basic.
• Green — team lead.
• Black — expert.
• Master Black — mentor.