This chapter presents working definitions for resilience, sustainability, and other related terms. It describes several examples of how urban sustainability and resilience have been pursued in shrinking cities. The chapter focuses on policy instruments to provide understandings of sustainability and resilience within the existing broader context of urban development. Resilience and sustainability strategies provides urban planners and researchers with a valuable apparatus on which to craft and test new, potentially "social urbanism-like" ideas for understanding and managing shrinking cities. The examples of "sustainable development" in shrinking cities implicate a few broad points of contention over how sustainability is portrayed and pursued within the American model of urban development. The elements of the New Orleans Citywide Strategic Recovery and Rebuilding Plan (CSRRP) read almost like a locally-adapted and context-sensitive version of the citywide "social urbanism" program initiated earlier in Medellin, Antioquia, Colombia.