Lab member Christopher Marcum presented findings from the Improvisation in Emergency Response Project at the Annual Hazards Workshop in Bloomfield, Colorado. This project is an NSF funded research initiative charged with understanding the relationship between improvisational and conventional behavior in uncertain situations, especially during disaster response scenarios. Our case studies span two major U.S. domestic disasters—the 1995 bombing of the Alfred P. Murrah Federal Building in downtown Oklahoma City and the 2001 terrorist attacks on the World Trade Center in New York City, two types of response agencies—police and fire, and two types of data sources—informant reports and radio transcripts. This is an extensive comparative study of responses to anthropogenic disasters. The analyses summarized here come from a variety of research methods including simple cross-tabs to complex simulations and relational event modeling. The datasets used in this research are packaged as R data objects, complete with documentation, for future public distribution.