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In the present study, we assessed the effectiveness of an extensive training and feedback program with investigative interviewers of child victims of alleged abuse and neglect in a large Canadian city. Twelve investigative interviewers participated in a joint training initiative that lasted eight months and involved classroom components and extensive weekly verbal and written feedback. Interviewers were significantly more likely to use open-ended prompts and elicited more information from children with open-ended prompts following training. These differences were especially prominent following a subsequent ‘refresher’ training session. No negative effects of training were observed. Clear evidence was found of the benefits of an intensive training and feedback program across a wide variety of investigative interviews with children. Although previous research has found benefits of training with interviewers of child sexual assault victims, the current study extends these findings to a wide range of allegations and maltreatment contexts.