A longitudinal study of ego development.

Using the Washington University Sentence Completion Test of Ego Development, 32 lower-class and lower-middle-class 12th graders (Group A) who had been given the test by A. Blasi (1971) as 6th graders were retested. The relationship between ego development and vocational attitudes and plans was also examined using a vocational choice questionnaire and the Career Maturity Inventory (CMI). To increase sample size, an additional 23 12th graders (Group B) were also administered the 3 measures. Results of statistical analyses show an increase at the .0005 level between 6th and 12th grades. Among Group A, sex differences at both grade levels were not significant; however, among Group B, girls had significantly higher ego levels than boys. In addition, ego development was significantly related to vocational maturity but not to reasons for vocational choices. Ego levels for 6th and 12th graders were significantly lower than those of middle- and upper-class Ss of comparable ages tested in other studies, suggesting a significant relation between ego development and socioeconomic status. Results are seen as evidence for the developmental nature of the ego, and support the sequentiality hypothesis, which suggests that stages follow in an invariant order. (PsycINFO Database Record (c) 2010 APA, all rights reserved)