ABSTRACT
The Structure-of-Intellect (SOI) model, described most completely by J. P. Guilford (1967), is the most comprehensive of the factor-analytic models of intelligence. Prior to its introduction, numerous factor-analytic studies of intelligence were capable of identifying only 40 separate factorial abilities. In less than 10 years of work, however, researchers at the Aptitudes Research Project at the University of Southern California identified over 100 abilities (Guilford, 1988). The SOI is a morphological model of intelligence that organized the large number of factors that was generated by this research during the 1950s and 1960s along with those that was derived by Thurstone (see Chapter 5) and other previous researchers.
