Lean Six Sigma Have 4 phases to master in it. In first phase delegates starts from White belt Six SIgma.In the next phase, delegates move towards Yellow Belt Six Sigma to increase his or her knowledge. The Third phase of Six Sigma is Green Belt. Green belt Six Sigma hold maximum knowledge of 6 Sigma methodology but not as much as expert level. For this, there is Black Belt Six Sigma to professional with expert-level knowledge.