The Amateur Softball Association's rulebook has many differences from the National Collegiate Athletic Association and the National Federation of State High School Associations' rulebooks; it has a unique definition of the strike zone and differences in managerial tasks such as filling out the lineup card. The ASA rulebook also defines bunts and catch differently than the NCAA and NFHS rulebooks.
A bunt is defined by the ASA rulebook as any ball that is intentionally tapped into play by a bat, rather than swung. The ASA allows the batter to hold the bat in the strike zone as the ball crosses the plate without a strike being called, while the NCAA and NFHS require the batter to withdraw the bat to avoid a strike. The ASA defines a catch as a play in which a fielder catches the ball in his glove with both feet in live territory or one foot in live territory and one in the air. The NCAA uses the same definition, but the NFHS requires that both feet be in live territory.
The ASA defines the strike zone as between the armpits and top of the knees; any part of the ball can cross the zone for the pitch to be called a strike. Under ASA rules, there is no penalty for presenting an inaccurate lineup card; in other rule formats, inaccurate lineup cards can lead to players being declared ineligible to play or the manager being restricted to the dugout for the entirety of the game.