In the 1986-87 season, the current format for Greek professional basketball, consisting of the A1 National Category and the A2 National Category was formed.
Starting with the 2015-16 season, playoffs were added between the 2nd and 5th placed teams for promotion to the 1st tier Greek Basket League, and a one-game play-out was added to decide relegation to the 3rd tier Greek B Basket League [REF].