Cohort-based courses (CBCs) are synchronous online programs where a fixed group of students learn together, with live sessions, peer support, and fixed start/end dates. Unlike self-paced courses (high dropout), cohorts create accountability, community, and completion. Instructors run 1–3 cohorts per year; students pay $500–$3k per course; completion rates are 60–80%. Key differences from self-paced: