Here is a comprehensive summary of the OSAA in 5 sentences:

The Oregon School Activities Association (OSAA) is a non-profit organization based in Wilsonville that regulates high school athletics and competitive activities across Oregon, originally established in 1918 as the Oregon State High School Athletic Association before adopting its current name in 1947. The board-governed group sponsors an impressive 74 state championships across 19 interscholastic activities—including sports, music, and forensics—and operates as a member of the National Federation of State High School Associations. To ensure equitable competition among its public and private members, the OSAA uses a classification system based on student enrollment, ranging from 1A (fewer than 65 students) to 6A (1,026 or more students). This six-class structure replaced the previous four-class model in the 2006–07 school year, a change that sparked significant controversy and legal challenges, though the six-class system was ultimately retained in 2017. Schools are then organized into regional leagues such as the Portland Interscholastic League and the Metro League, featuring notable members from historic public institutions like the Grant Generals to private powerhouses like the Jesuit Crusaders.