The AASM publishes the International Classification of Sleep Disorders, which serves as a guide to clinicians in the identification of specific sleep disorders. The current, third edition (ICSD-3) was published in 2014. The AASM also publishes the AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, the definitive reference for the evaluation of polysomnography (PSG) and a home sleep apnea test (HSAT). This resource provides rules for scoring sleep stages, arousals, respiratory events during sleep, movements during sleep and cardiac events. It also provides standard montages, electrode placements and digitization parameters. The current version 2.5 was released in April 2018.