The What Works Collaborative is a foundation-supported partnership that conducts timely research and analysis to help inform an evidence-based housing and urban policy agenda. In its latest effort, the Collaborative engaged with experts to identify unanswered questions critical to policy development, and from this derive "field-building" research agendas. These agendas are intended to help guide investments that will inform and advance policy and practice over the next three to five years on five broad policy domains: housing as a platform for overcoming social and economic distress, housing markets, housing finance, successful neighborhoods, and the physical landscape of the next American economy. This summary is part of a series of field-building research agendas produced under the What Works Collaborative. More information can be found on the What Works Collaborative web page.