The system works with a promotion-relegation system, meaning that a team from the lowest level of the system can make it to the top level after a number of years. The number of teams in each league often changes from season to season, due to the lack of any professional management in the lower levels of the system. Currently the IPL is the only league that is considered professional, despite many of its rules about club facilities and management being broken. It is not uncommon for teams in the lower levels of the system to change team names because of sponsorship issues or for teams to completely withdraw from a competition.