This evaluation focused on the developing interviewing skills of 104 active crimeinvestigators in Sweden who participated in six different half-year courses between 2007 and 2010. The courses emphasised a combined model of the National Institute of Child Health and Human Development Protocol and the PEACE model of investigative interviewing. The teaching was interdisciplinary. The evaluation involved interviews of 208 children, most of whom were suspected victims of physical abuse. The investigators used two-thirds fewer option-posing questions and three times as many invitations after training as they did before training. These data show that the training was very effective in shaping the interviewers behaviour into better compliance with internationally recognised guidelines.