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.

2019-2020 Results

Data findings from the 2019-2020 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 2019Spring 2020Total
Number of SI Sessions Offered1,9161,4423,358
Total Contact Hours with SI Participants25,75310,79536,548
Number of Unique Students Attending SI*4,3862,4525,590*
Mean Size of Standard SI Sessions106N/A
Number of Courses with SI Offered3229N/A
Number of Departments Supported1311N/A
Number of SI Leaders on Staff5343N/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+ 0.27+ 0.30N/A
Average GPA Difference of SI Participants who attended once per week vs Non-SI Participants+ 0.57+ 0.64N/A

*1,248 students attended SI during both fall 2019 and spring 2020 semesters, making 5,990 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 2019Spring 2020
Non-SI Participants2.512.65
Students Attending 1-4 SI Sessions2.732.93
Students Attending 5-9 SI Sessions2.933.03
Students Attending 10-14 SI Sessions2.973.04
Students Attending 15+ SI Sessions3.083.29


In addition to increased student success, SI participation also aided in university retention efforts. Approximately 87% of SI participants received a final course grade of C- or higher, compared to only 74% of non-participants. Non-SI participants also withdrew from a course more often than SI participants.