In 2003, Volume 1 of the Health Disaster Management: Guidelines for Evaluation and Research in the Utstein Style 1 was published. Publication of this monograph was an effort by organizations representing international disaster professionals and communities to define disaster terms and research standards. The 2003 publication became known as the ''Guidelines for Disaster Research and Evaluation.'' It took seven years to complete and was based on collaboration using the Utstein 2 method for consensus. The primary goal for the 2003 Guidelines was to provide structure for research and evaluation of disasters to allow for comparison of data and information and to operationalize much of the information developed regarding disaster sciences.In the past decade, disaster research and evaluation have continued to evolve. During this time, disaster science has become recognized as a legitimate field for scientific exploration and is accepted by academics and those involved in actual events. In evolution, disaster science has developed newer areas of focus including mass-gathering medicine, emergency public health, humanitarian response, and simulation evaluation. Additionally, traditional disaster science has become more sophisticated, with exploration of the fundamental aspects of disaster epidemiology, mitigation, response, and effects.Most problematic for application of disaster research has been difficulty in agreement on the meaning and definition of terms used to describe concepts and study variables. Since 2003, there have been concerted efforts to develop consensus on definitions of disaster research terminology in guidelines for acute medical response in disaster events. 3 In this issue of Prehospital and Disaster Medicine (PDM), the overview paper for the latest effort to refine disaster research and evaluation is published. 4 This newest work by Birnbaum, Daily, O'Rourke, and Loretti represents years of research and refinement of concepts and frameworks for disaster research. The authors recognize five frameworks for disaster research and evaluation: (1) Conceptual; (2) Longitudinal; (3) Transectional Societal; (4) Relief-Recovery; and (5) Risk Reduction. Reliefrecovery and risk reduction have long been recognized categories for disaster research. For relief-recovery and risk reduction, the authors of the new paper provide updated concepts and refined definitions of terminology.The Conceptual framework is a foundation for the other research and evaluation frameworks, and includes standardized definitions of the terms used to describe factors that lead to and affect the occurrence and severity of a disaster. This is perhaps the most controversial area explored by the frameworks because disaster experts have failed to agree on operational disaster-related terms and definitions. The ongoing debate over terminology has done much to limit the effectiveness of disaster research and evaluation. In a field of research where data is difficult to obtain and variables hard to predict or control, the lack of standardized te...