Hello, I am really interested in six sigma and the vital information regarding it. I do hear of yellow belt, green belt and black belt please what individual functions does these play in the accomplishment of six sigma role or goals in the organisati

Hello, I am really interested in six sigma and the vital information regarding it. I do hear of yellow belt, green belt and black belt please what individual functions does these play in the accomplishment of six sigma role or goals in the organisation or industry. Thanks.