Jim Foster, a promotions manager with the National Football League (NFL), conceived the idea of indoor football while watching an indoor association football match at Madison Square Garden in 1981. While at the game, he wrote his idea on a 9x12 envelope from his briefcase with sketches of the field and notes on gameplay. He presented the idea to a few friends at the NFL offices, where he received praise and encouragement for his concept. After solidifying the rules and business plan, supplemented with sketches by a professional artist, Foster presented his idea to various television networks; he reached an agreement with NBC for a "test game".