Guidance is offered to attorneys preparing to cross-examine mental health experts in child custody litigation. The author provides information concerning the review of an expert's curriculum vitae and agreement with the parties; responsiveness to professional standards; evaluative procedures; use of collateral source information; selection of assessment instruments and utilization of computer-generated interpretive reports; and the degree to which opinions offered are supported by the data. Emphasis is placed upon the critical examination of an evaluator's specialized education and training and the significance (or lack thereof) of board certifications. Also examined in depth is the means by which to utilize an evaluator's contemporaneously taken notes in the development of areas of inquiry during cross-examination.