Rarely discussed 15 years ago, thecommitment of political leaders to reform--that is, theirwillingness to implement and sustain reform--is now widelyaccepted as crucial for aid effectiveness. Nowhere ispolitical commitment more important--and more difficult tosustain--than in implementing reforms to fight corruption.Governments increasingly seek external assistance to meetthis challenge. More than any other public sector reform,reducing corruption may threaten poltical coalitions and agovernment's survival--and threats to politicalsurvival weaken the resolve of even the most committedleaders. This Note describes methods that might be used toobjectively evaluate a government's politicalcommitment to reducing corruption, whether petty, grand or systemic.