Information is reported on the intellectual maturity of children 6 through 11 years of age in the United States as estimated from the 1963 Goodenough-Harris Drawing Test data obtained in the Health Examination Survey of 1963-1965. Consideration is limited in this first report of a series of reports on these test findings to age and sex…

Development of The Assessment of Basic Competencies (ABC), a test battery based on the three-parameter logistic model, is described. Eleven dimensions of intellectual growth are measured, from the pre-kindergarten level through ninth grade. An educationally relevant skill domain is represented by each test. Unique properties of the test, based on…