Indirect and direct assessment methods have a long standing history in college learning centers. Being more resource-intensive and time-consuming, direct assessment methods are often underrepresented in the literature and in practice. This paper presents a case study of how a pretest-posttest assessment initiative was designed to measure student learning during supplemental instruction (SI) sessions. Significantly higher post-test scores illustrate that similar direct assessment methods can be used effectively by learning center administrators to document student learning, improve training programs, and improve the value offerings of their centers.