My research focuses on the influence of context upon both behaviours and diseases related to sanitation, hygiene, and water. For my PhD, I used multilevel modelling of trachoma impact survey data from Amhara Region, Ethiopia to examine the effect of community sanitation levels on active trachoma and soil-transmitted helminth infections in children. Also, using a geographic information system to combine survey data with compiled information on environmental and sociodemographic factors, I examined their relationships with community levels of sanitation. My earlier research in Lima, Peru examined the influence of water and sanitation availability in periurban households upon mothers’ handwashing behaviour at critical moments.