The factor analysis of numerous aptitude and ability tests provided the basis for Guilford’s SOI Model. The division of intellectual abilities into three dimensions-contents, operations, and products-and their subdivisions givers this model the means to show interrelationships between and among human abilities (Guil-ford, 1967).Some educators, especially Meeker (1969), extend the use of the SOI Model to serve as a basis for a diagnostic –prescriptive tool in the teaching of thinking skills.