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Stability of Factorial Validity of the Iiq (Instructional Improvement Questionnaire) Over Three Years

For the years of 1973, 1974, and 1975, the Instructional Improvement Questionnaire (IIQ) was used as the campus-wide teacher and course evaluation instrument at Southern Illinois University at Carbondale. In order to assess the stability of the factors being measured by the instrument, separate factor analyses were run on the 40 questionnaire items for the years of 1973, 1974, and 1975, from which the variables of expected grade by a student, percent of students taking the course as an elective, and student's year were partialled out. The factors yielded by the analyses were remarkably stable over the three years. Canonical correlational analyses were done to investigate factorial similarities among the years. Results indicated substantial agreement among the factor structures for the three years taken individually and combined.