The current minor league classification system categorizes leagues as Triple-A (AA), Double-A (AA), Class A (Single-A or A), Class A Short Season, and Rookie. There are several classes of Minor League Baseball teams: Single-A, Double-A, and Triple-A. The designation of a team's level is based on its place in the organizational structure. In general, higher up the ladder a team is, lower is its title. However some teams classified as Triple-A will not play in the National Association or American Association of Independent Professional Baseball leagues. There are eight minor league regions in North America that contain 32 teams each. Each region has two groups of four teams who play a series of games against the other group to determine which team will advance to the next round. The final two teams in each group go into the regional playoffs to compete for the championship. At the end of each season, the team with the best record gets to choose where it would like to play its home games. If it chooses not to use its option, then the other team can select its location by signing an agreement with another club. Teams usually pick high-profile locations that draw crowds of baseball fans. Some teams may have only one game per week during the regular season, while others may have three or four games per week.