Rwanda's completion, in 2012/13, of a land tenure regularization program covering the entire country allows the use of administrative data to describe initial performance and combine the data with household surveys to quantify to what extent and why subsequent transfers remain informal, and how to address this. In 2014/15, annual volumes of registered sales ranged between 5.6 percent for residential land in Kigali and 0.1 percent for agricultural land in the rest of the country; and US .6 billion worth of mortgages were secured against land and property. Yet, informality of transfers in rural areas remains high. Decentralized service provision and information campaigns help reduce but not eliminate the extent of informality. A strategy to test the efficacy of different approaches to ensure full registration, scale up promising ones, and rigorously monitor the effect of doing so is described.