Green Belt. A green belt is generally a part time role in organizations. On an average, a green belt spends about 25% of its time on projects. Green belts generally do smaller projects that are confined to their business or functional areas. In summary, greenbelt has basic knowledge on key statistical concepts, leads smaller Six Sigma projects, participates on a black belt project team approaches black belt for any problems he or she faces during the project is generally a part time role. has authority in the business process is trained on change management and effective facilitation skills.