There are 3 main types of TV scheduling strategies: inheritance, where a new program airs after a popular one to inherit some of its audience; pre-echo, where a program airs before a popular one in hopes viewers will tune in early and return for future airings; and hammocking, where a program airs between two popular ones to benefit from both audiences. Some channels also historically relied on channel loyalty, though viewers are less likely to stick to one channel all night now.