In September 2013, ACL and ASPE contracted with Walter R. McDonald & Associates, Inc. (WRMA) to develop and pilot NAMRS. In developing NAMRS, WRMA worked with ACL, ASPE, and the National Adult Protective Services Association to convene key stakeholders to identify data elements that are the most critical for a national system. More than 40 state administrators, researchers, service providers, and other stakeholders provided input in focus group conference calls. Additionally, more than 30 state representatives from 25 different states met in three in-person working sessions to discuss the uses and key functionalities of collected data. NAMRS was developed as a system that is responsive to the diversity of APS programs around the country. With technical assistance from WRMA, the system was tested in nine diverse states. Based on the pilot results, which included feedback from the pilot states, WRMA delivered a final report and system to ACL in September 2015. Based on the final report, a review of system requirements, and additional stakeholder input, WRMA finalized the requirements, with ACL approval, in 2016.