Following reports of sexual exploitation of refugees in West Africa in 2001 and in Nepal in 2003, the UN Secretary-General issued a Bulletin obliging UN agencies and their partners to prevent, and when suspected, to investigate any sexual exploitation and sexual abuse (SEA) by humanitarian staff. Humanitarian organisations began adopting and revising Codes of Conduct and other related policies. This evaluation is a critical component underpinning the larger SEA prevention and response equation as the humanitarian community makes efforts to build capacity to receive and investigate allegations of sexual abuse - or exploitation-related staff misconduct.