The JOI was administered to both experimental and control groups for each of the six sites: Ventura County, Calif.; Washington, D.C.; Clayton County, Ga.; Boise, Idaho; Oklahoma City, Okla.; and Dane County, Wis. The JOI was designed to obtain information on (1) offender background characteristics; (2) factual and attitudinal information about the offense, co-offenders, and victim; (3) opinions on the fairness and severity of the juvenile court sanctions; (4) offenders' perceptions as to labeling by teachers, parents, and peers; and (5) the self-rated likelihood of future criminal behavior. Each site report follows the same format, beginning with a description of the treatment groups at the site and proceeding to a summary of particulars related to JOI administration (dates of administration, random assignment violations, group sizes, etc.). Descriptive tables are provided, and issues related to survey administration and experimental design are addressed. This report does not analyze the findings in terms of specific hypotheses, and is therefore purely descriptive. The appendix contains the JOI; 9 references and 10 footnotes are listed.