The Jesness Inventory (JI; Jesness, 1972) was developed primarily for use in the psychological
assessment of juvenile delinquents. It consists of 10 scales designed to measure various personality
characteristics and an Asocial Index used in the prediction of delinquency, the latter being derived
from a discriminant function analysis of the JI scales. Despite extensive use, there has been little independent
assessment of the JI reliability. Corrected split-half reliabilities based on 1,862 delinquent
and nondelinquent boys and test-retest correlations over an 8-month period for 131 delinquents are
presented in the JI manual; the only result given for the Asocial Index, however, is a test-retest coefficient
over a 1-day period for 57 delinquents under conditions encouraging fake good responses.
The only other published assessment of scale reliabilities has been by Shark and Handal (1977), who
reported test-retest reliabilities similar in magnitude to those presented by Jesness for 62 delinquent
and nondelinquent subjects. The present study examines the current reliability
Jesness for 62 delinquent
and nondelinquent subjects. The present study examines the current reliability of the JI with South Australian delinquents.