PiR² applies multiple disciplinary strategies and methodologies to a common data set (GCAFH, SCAFH, GCPI, other), which has been assembled of samples from the world’s worst or largest disasters including but not limited to Hurricane Katrina, Hurricane Sandy, and the Joplin, MS tornado.  These data are derived through primary data collection via Disaster ResearchWorks or through collaboration with other scientists.  The program’s strategy is to develop a core survey instrument of common data elements, and a standard timeframe and research protocol – for example, to recruit populations within two to five years of disaster event, and ask common set of questions about one randomly selected child in the household.