This field workbook supports the implementation of the interagency (FAO, UNICEF, WHO) “Communication for Behavioural Impact (COMBI): A toolkit for behavioural and social communication in outbreak response”. It is a handheld guide and notebook for applying the WHO COMBI methodology in 7-steps, during an outbreak. It is primarily intended for risk communication, developmental communication and health promotion/education personnel working in multidisciplinary teams to investigate and respond to disease outbreaks. It contains essential tools, checklists, and information needed to design effective behavioural and communication interventions in support of outbreak prevention and control objectives - to limit loss of life and minimize disruption to families, communities and societies