The International Softball Congress (ISC) is a non-profit association for the promotion and administration of men's and boys fastpitch softball throughout North America with athletes coming from all over the world.
The ISC allocates berths by region to qualifying tournaments throughout North America.
Teams gain entry by winning one of the allocated berths or by accepting an at-large invitation.
The current format has 48 teams taking part in a modified double elimination bracket.
The first 16 teams eliminated are relegated to the ISC II Tournament.