Section 2031 of the Water Resources Development Act of 2007 (Pub. L. 110-114) called for revisions to the 1983 Principles and Guidelines for Water and Land Related Resources Implementation Studies, resulting in the issuance of the Principles and Requirements (P&R) guidance document in March 2013 and the Interagency Guidelines in December 2014, which together comprise the Principles, Requirements, and Guidelines (PR&G). The PR&G are intended to provide a common framework and comprehensive policy and guidance for analyzing a diverse range of water resources projects, programs, activities, and related actions involving Federal investment in water resources.  The U.S. Army Corps of Engineers (Corps) proposes a regulation to show how it would apply the PR&G to the Corps’ mission and authorities.  In this proposed regulation, the Corps intends to increase consistency and compatibility in Federal water resources investment decision making to include considerations such as analyzing a broader range of long-term costs and benefits, enhancing collaboration, including a more thorough and transparent risk and uncertainty analyses, and improving resilience for dealing with emerging challenges, including climate change.