In this paper, the author describes the origins of a research programme focused on children's testimony, noting that it was prompted initially by a focus on the effects of abuse. Growing evidence of failed communication between researchers and investigative interviewers led his research group to develop a detailed guide, based on extensive research, which forensic interviewers could use to structure their interactions with alleged victims, offenders and witnesses. Considerable research has since documented the value of that tool, and it has also been instrumental in research exploring children's communicative and cognitive development. Copyright © 2014 John Wiley & Sons, Ltd.