AbstractThis article describes (1) an intrafamilial child sexual abuse case and (2) the multidisciplinary research project which developed from its outcome. The research project., in existence since 1987, is a task force of the Committee an Children, Youth, and Families of the New Jersey Psychological Association and is co‐sponsored by the Committee on Child Psychiatry of the New Jersey Psychiatric Association. The research aims at developing an objective behavioral assessment instrument to validate child sexual abuse allegations, and at achieving a clinical‐legal consensus regarding the credibility of the instrument. Ranking, reliability, and validity studies are descri