Family courts frequently rely on the expertise of mental health professionals to assess allegations of sexual abuse within the context of child custody evaluations. Such evaluations are complex and require knowledge of techniques used in sexual abuse and sexual offender evaluations, as well as knowledge of child custody practices. Preliminary findings from a national survey of 84 psychologists indicated that respondents tend to adhere to the child custody guidelines of the American Psychological Association. However, few practitioners followed formal models, protocols, or guidelines when evaluating alleged victims or alleged perpetrators of sexual abuse in conjunction with child custody disputes. Implications for professional practice are discussed, along with a proposed comprehensive model for assessing sexual abuse allegations in child custody cases. How do psychologists assess sexual abuse allegations within the context of child custody cases? This critical issue warrants close examination in light of the increased concern and attention such cases have captured in family court proceedings during the past 15 years. Sexual abuse allegations may surface prior to the divorce decree or after a custody/visitation agreement has been established. They can profoundly impact the proceedings and create an atmosphere of uncertainty and mistrust. Visitation or contact with the alleged perpetrator is often supervised or suspended, and the family court is often perplexed and overwhelmed by the complex decisions required in such cases. As a result, the court commonly seeks the expertise of mental health professionals to assess the veracity of such allegations. The assessment of allegations of sexual abuse in custody cases is complex. First, a variety of family dynamics underlie such allegations. Motives of the parties involved may range from a need to protect the child because of safety concerns to vengeance, vindictiveness, and hostility over the marital break-up. Therefore, the evaluator needs to explore and understand the family system and evaluate the validity of the complaints. Second, in contrast to extrafamilial cases, in custody cases the alleged perpetrator and other relevant parties are typically part of the evaluation process. As a result, better opportunities exist to gather a global and thorough view of the alleged event. Third, there is much overlap in the types of symptoms exhibited by children from high-conflict divorces and children who have been sexually abused, which makes it difficult to distinguish between the two groups (McGleughlin, Meyer, & Baker, 1999). Lastly, the evaluator must have knowledge of three forensic areas: (a) practices and procedures in the child custody area, (b) sexual abuse evaluation techniques, and (c) assessment of alleged sexual offenders. The integration of these three areas provides an exceptionally challenging task for the