Three research questions were posed for a study: (1) Are there differences among the Piagetian scores of students in the various teaching majors? (2) Do students at various cognitive levels differ in academic achievement? and (3) Do students in different teaching majors differ in achievement? The population included 670 education students enrolled in a course in developmental psychology. Of these, 33 were early childhood majors, 276 were elementary education majors, 188 were secondary education majors, and 168 were K-12 certification majors (i.e., music, art, and physical education). The remaining five had not declared a major. A written test requiring the use of syllogisms, verbal analogies, proportional reasoning, and hypothetical reasoning determined the students' cognitive levels--concrete operations, transition between concrete and formal, and formal. Findings revealed that secondary education majors had significantly higher cognitive levels than did early childhood, elementary, and K-12 majors. These findings are analyzed, and it is suggested that grouping students by major may help them learn more effectively than grouping them in sections where all majors are represented. (JD)