The following instruments of parenting capacity that are currently used in child custody evaluations are reviewed: The Ackerman–Schoendorf Scales for Parent Evaluation of Custody (ASPECT), the Bricklin Perceptual Scales and Perception of Relationships Test, the Child Abuse Potential Inventory, the Parent–Child Relationship Inventory, and the Parenting Stress Index. Each instrument is described, as well as research on the measure's norms, reliability, validity, and generalizability. The measures are discussed with regard to their approach in assessing parental effectiveness and principles of test construction.