Memories are the ultimate foundation of testimony in legal settings ranging from criminal trials to divorce mediations and custody hearings. Yet there is mounting evidence of the various ways in which they may be susceptible to distortion. This work offers an overview of what we now understand about children's and adults' eyewitness capabilities - and of the important practical and theoretical implications of this new understanding. The authors, leading clinicians and behavioural scientists with diverse training experiences and points of view, provide an insight into the social, cognitive, developmental and legal factors that affect the accuracy and quality of information obtained in forensic interviews.