Social Protection (SP) and Social SafetyNet (SSN) programs channel a large amount of publicresources, it is important to make sure that these reach theintended beneficiaries. Error, fraud, or corruption (EFC)reduces the economic efficiency of these interventions bydecreasing the amount of money that goes to the intendedbeneficiaries, and erodes the political support for theprogram. While no program is immune to EFC, evidence fromdeveloped countries demonstrates that such leakage can bebrought to negligible levels. In five Organization forEconomic Co-operation and Development (OECD) countries (UK,Canada, Ireland, New Zealand, and USA) this fraction isbetween 2-5 percent for the SP sector as a whole. For SSNprograms, which use more complex eligibility criteria andhence are more prone to EFC, this fraction is 10 percent. Toachieve these results, programs have implemented a number ofmeasures reviewed in this note. In contrast, efforts tocombat or even measure EFC are quite rare in developingcountries, although some programs are plagued by it.