<p>Radio Frequency Identification (RFID) technology is gaining rapid acceptance as a means to track a wide array of manufactured objects. Currently, RFID technologies have shown promise in transportation (e.g., smart fare cards) and commerce (e.g., inventory control) for a variety of uses and are likely to find many new applications in both military and civilian areas if and when current technical issues are resolved. There are a number of policy concerns (e.g., privacy), however, that will become more crucial as the technology spreads. This report presents a summary of a workshop, held by the NRC at the request of the Defense Advanced Research Projects Agency, to explore many of the key technical and policy issues. Several important themes that are likely to govern expansion of RFID technology emerged from the workshop and are discussed.</p>