Block programming or
television block is a strategy of
broadcast programming and
radio programmers. Block programming can simply be defined as arranging programs on radio or television so that similar programs or programs of the same sort of genre are aired one after another. The concept is to provide similar programming to keep the viewers interested in watching. Radio stations use it consistently, by programming the same type of music for long periods of time. Notable examples of block programming was
NBC's Thursday evening "
Must See TV" lineup, which included two hours of sitcoms and one hour of
ER, and
Channel 4's "T4" program which often ran sitcoms like
Friends back-to-back for an hour or more. This strategy is particularly common in
cable television, where
reruns are assembled into similar blocks to fill several hours of generally little-watched daytime periods. A particularly long program block, especially one that does not air on a regular schedule, is known as a
marathon.