In cases of alleged sexual abuse, major issues have arisen concerning the credibility of child witnesses, their competency to testify, and the possible effects of legal proceedings on the child witness-victim. In response to these issues, some States have adopted a presumption of competency, others have abolished corroboration requirements, and some have developed hearsay exceptions. The concern over child-witness credibility and competency has led to increased use of expert witnesses. Psychological clinicians are likely to find themselves consulted formally or informally on children's developmental trends and cognitive capabilities, including memory and suggestibility and behavioral symptoms of abuse. Additional concerns about the effects of criminal justice processing on the child have resulted in procedural reforms designed to reduce victim-offender confrontation and avoid placing undue stress on the child. Despite such reforms, the most effective innovations to assist sexually abused children rely on the competency of the factfinder: skills in communicating with children, sensitivity to their concerns, preparation of the child for the process, management during it, and followup. Such competencies can reduce stress and improve the quality of the child's testimony. 6 notes and 119 references.