In the first decades of USC’s existence, class times were fixed by the campus clock tower, and any alteration required a physical notice posted at the central quadrangle. Professors adhered to a rigid timetable that reflected the industrial workday of the Progressive Era, reinforcing a collective rhythm that bounded students to a shared campus pulse.
The 1940s ushered a wartime overhaul; with many faculty enlisted, class schedules became fluid, accommodating night courses for returning servicemen and accelerated terms for war‑related research. By the 1970s, enrollment surges forced USC to adopt a tiered schedule system, assigning different start times to freshman, senior, and graduate cohorts, a practice that persisted until the digital age reshaped notification methods.