Studies of empirical relationships between indicators of prison crowding and inmate violence have uncovered null, negative, and positive relationships. These mixed findings may be due, in part, to cross-study differences in definitions of crowding, levels of analysis, and sample designs. We compared findings across some of the more popular approaches to study the relationship between facility crowding and the prevalence of inmate assaults in order to determine the implications of different methods for variation in estimates. Multi-level data from a national sample of 10,022 men confined in 203 state correctional facilities during 1997 were examined. Findings revealed differences across methods in the direction and significance of the crowding/assault relationship. These differences were then considered in order to derive a strategy for more uniform research on the topic. This strategy consists of including both total inmate population and design capacity as separate predictors in the same model, examination of tri-level data (inmates, facilities, and states) in order to control compositional differences in inmate populations across facilities and to remove confounding state-level differences in crowding levels and assault rates, and more careful consideration of secondary analyses of complex samples with sample weights.John Wooldredge is a professor in the Division of Criminal Justice at the University of Cincinnati. His research and publications focus on institutional corrections (crowding, inmate violence, inmate adaptation), and criminal case processing (sentencing and recidivism, extra-legal disparities in case processing and outcomes). He is currently involved in research on inter-judge variability in sentencing, victim-based disparities in case processing, and official responses to prison inmate rule violations. Ben Steiner is an assistant professor in the Department of Criminal Justice at the University of South Carolina. He received his Ph.D. in Criminal Justice from the University of Cincinnati in 2008. His research and publications focus on juvenile court (case processing, sentencing, and factors influencing whether juveniles are bound over to adult courts), and institutional corrections (crowding and inmate deviance). His most recent project involves a comprehensive analysis of rule violations in all Ohio and Kentucky prisons, including examination of individual and facility effects on inmate rule violations, official responses to rule violations, and differences in findings for officially detected versus self-reported infractions. Correspondence to: