A 20-year study to verify Lawrence Kohlberg's theory of moral development through a new research design, the Standard Issue Scoring System, is reported. Kohlberg theorizes that an individual progresses through several stages in attaining moral judgment. As children grow older, they are able to integrate diverse points of view on a moral conflict. Thus, each stage presupposes understanding gained at previous stages. The Standard Issue Scoring System for monitoring developmental stages replaces earlier evaluation techniques which have not proved reliable. A major portion of the document is devoted to a detailed description of the method, reliability, validity, and results of Standard Issue Scoring. The study found that the 50 males interviewed (6 times in 3- to 4-year intervals) proceeded through the stages in the hypothesized sequence. Moral judgment was found to be positively correlated with age, socioeconomic status, IQ, and education. The Standard Issue Scoring System was found to provide a valid measure. (KC)