The International Center for Transitional Justice (ICTJ) and the United Nations Development Programme, with the support from the governments of Denmark and South Africa, held a retreat on Supporting Complementarity at the National Level: An Integrated Approach to the Rule of Law, at Greentree in Manhasset, New York, from December 7 through 9 in 2011. The retreat was conducted according to the Chatham House Rule, and this report provides a summary of the principal discussions without attributing views to individual participants.