The Physician and Physician Practice Research Database (3P-RD) is intended to be a prototype database that captures information on physician and physician practice characteristics to help address current data gaps within health services research. NORC will be using available administrative data and provider databases to capture the universe of active physicians and physician practices to develop the 3P-RD database. This prototype will be for AHRQ's internal research purposes, and will also include a design that can be potentially used to create public release research databases. The 3P-RD prototype will contain data for 13 states and include data elements related to physicians and physician practices' characteristics pertinent to analyzing health services research and policy questions. This prototype is part of the feasibility study NORC is conducting that will identify options and provide recommendations for AHRQ’s consideration of how to establish a program that regularly creates and maintains these databases. Examples of possible health research or policy questions the database will be useful for answering include, but are not limited to: 1) How many unique physicians holding a current license to practice medicine in the state are actively providing services? 2) Of the physicians who actively provide services, what percent provide services to patients full-time versus part-time? 3) What are the patient population characteristics for practicing physicians (i.e. % commercial vs Medicaid vs Medicare as well as gender / age characteristics)? 4) How does the mix of provider types within a physician practice change over time? 5) How are physician practice migration patterns changing over time? 6) What factors are associated with physicians’ practice behaviors?