SI Assessment

The Iowa State University SI program is continually assessed through the following methods:

  • Attendance and participation data
  • Scheduling surveys
  • Mid-semester student evaluations
  • Feedback from faculty
  • SI Leader self-evaluations

Supplemental Instruction (SI) is an internationally developed student learning program. The University of Missouri-Kansas City International Center for SI established a framework to guide our assessment.

2018-2019 Results

Data findings from the 2018-2019 academic year show that SI Leaders accumulated more than 55,000 contact hours with students. As SI data historically demonstrates, students participating in SI again experienced higher mean grade point averages (GPAs) than non-participants. SI participants in the fall semester earned an average 0.28 higher GPA than non-participants, and a 0.23 higher GPA in the spring.

Summary Data

Fall 2018Spring 2019Total
Number of SI Sessions Offered1,8841,9513,835
Total Contact Hours with SI Participants30,53325,38055,913
Number of Unique Students Attending SI*5,1154,1177,143*
Mean Size of Standard SI Sessions1210N/A
Number of Courses with SI Offered3333N/A
Number of Departments Supported1413N/A
Number of SI Leaders on Staff5346N/A
Mean Final GPA of Non-SI Participants2.502.40N/A
Mean Final GPA of SI Participants2.782.63N/A
Average GPA Difference of SI Participants vs. Non-SI Participants+ 0.28+ 0.23N/A

*2,089 students attended SI during both fall 2018 and spring 2019 semesters, making 7,143 the total unduplicated headcount for participating students.


Final GPAs were identified for varying levels or participation in SI sessions and revealed a positive correlation between frequency of attendance and student success. The data suggests that regular attendance at SI continues to be of more benefit for students than attendance only before review sessions. This finding is encouraging.

Student Success Based on Level of Participation in SI
(Mean Final GPAs)

 Fall 2018Spring 2019
Non-SI Participants2.502.40
Students Attending 1-4 SI Sessions2.722.57
Students Attending 5-9 SI Sessions2.912.78
Students Attending 10-14 SI Sessions3.122.88
Students Attending 15+ SI Sessions3.213.05


In addition to increased student success, SI participation also aided in university retention efforts. Approximately 82% of SI participants received a final course grade of C- or higher, compared to only 70% of non-participants. Non-SI participants withdrew from a course more often than SI participants.