A nine-a-side outdoor bat-and-ball game, originating in Britain and called ‘base-ball’ in A Little Pretty Pocket Book (1744). The game is seen as an early form of what was developed into baseball. Rules were formalized in the early 20th century, with a version published by the Ling Association in 1931. A National Rounders Association was founded in 1943. Played by both boys and girls, it is a sport still conducive to spontaneous forms of organization.