Green Belt (GB)

A role in Six Sigma by someone who has a moderate expertise in the Six Sigma (and possibly Lean) tools and concepts. The actual functions and responsibilities for this role vary but in general this person has a part-time dedication to leading projects that may yield benefits that are considered small for the organization. Their projects generally cover a shorter timeframe (like 1 to 3 months) and usually have a scope that is more limited to their functional area. This is a role that is commonly certified by many training organizations, although the requirements for those certifications vary considerably. This role is considered to be just below a Six Sigma Black Belt (BB) role, but isn't necessarily a requirement before attaining a BB certification.
Related StatStuff Video: 
   -Section 1-Introduction, Lesson #8 - Key Roles in a Lean or Six Sigma Project