Undergraduates who seek an academic challenge may participate in CU's Honors Program. Begun in 1931, the Honors Program currently consists of the top ten percent of incoming freshmen and participating undergraduates with a 3.3 GPA or greater (on a 4.0 scale). The program offers over 40 honors classes each semester taught by tenured or tenure-track professors and limited to class sizes of 15 students. Honors students also have the opportunity to graduate with honors, high honors, and highest honors, by writing and defending a thesis during their senior year. The program extends into the residence halls through the Kittredge Honors Program. The Presidents Leadership Class is a program for top scholars at the University of Colorado Boulder. Scholars participate in a four-year leadership development program. The program provides opportunities to the top fifty students at CU from every major and discipline.