Competency-based education (CBE) is an educational approach that bases academic advancement on demonstrated mastery of skills rather than completion of class hours or courses. The concept originated in the early 1900s with John Dewey's ideas about learning through doing and was further developed throughout the 20th century. Notable milestones included the Winnetka Plan in 1919, which introduced self-paced learning, and the standards movement of the 1980s-1990s, which established common educational goals across states. By the 2010s, several states including New Hampshire and Maine had implemented statewide CBE systems requiring high schools to award credit based on demonstrated competency rather than seat time.