According to the Department of Homeland Security (DHS), protecting and ensuring the resiliency (the ability to resist, absorb, recover from, or successfully adapt to adversity or changing conditions) of critical infrastructure and key resources (CIKR) is essential to the nation's security. By law, DHS is to lead and coordinate efforts to protect several thousand CIKR assets deemed vital to the nation's security, public health, and economy. In 2006, DHS created the National Infrastructure Protection Plan (NIPP) to outline the approach for integrating CIKR and increased its emphasis on resiliency in its 2009 update. GAO was asked to assess the extent to which DHS (1) has incorporated resiliency into the programs it uses to work with asset owners and operators and (2) is positioned to disseminate information it gathers on resiliency practices to asset owners and operators. GAO reviewed DHS documents, such as the NIPP, and interviewed DHS officials and 15 owners and operators of assets selected on the basis of geographic diversity. The results of these interviews are not generalizable but provide insights. GAO recommends that DHS develop resiliency performance measures, update Protective Security Advisor (PSA) guidelines, and determine the feasibility of developing an approach to disseminate resiliency information. DHS is taking action to implement two recommendations and is internally considering the third.