The purpose of my presentation on commitment is to show that in its core resides unrewarded behaviour, which is rare but essential to the conduct of social communities. Commitment is defined as an unequivocal behaviour of delivery, carried out under the worst conditions, when communities are unable to reward it. Unrewarded commitment is explored among 316 respondents. The newly defined commitment is mapped against conventional scales of commitment, and measures of perceived organizational power, perceived employment alternatives, personal values. Two types of unrewarded behaviour are identified: unrewarded commitment, which is not unrelated to traditional measures of commitment, such as affective and normative commitment, and extreme or Sisyphean unrewarded commitment, which displays organizational behaviour even with no affective, normative or instrumental attachment to the community.