I’m not sure which set of definitions I subscribe to, Larry Mudd’s have merit, but there’s room to move.
One could define shows as “formulaic” comedies, those which allow for a simple paint by numbers plots. Three’s Company, Bosom Buddies, Diff’rent Strokes and The Cosby show are good examples.
Then the “siutuational” comedy would be the ones in which the episode by episode variations are built upon strictly defined plotlines that are proffered and solved by the end of each episode. I’m picturing Get Smart, Moonlighting, Happy Days and such.
Perhaps the definitions are pedantic, but many ofthe previous shows were easy to fit in specific buckets.
Cheers, while built on a pretty basic premise, wasn’t quite as formulaic as some others. It’s was sorta like Seinfeld at a embryonic stage, lacking the bravado to really be different.
Cheers was revolutionary in one way, to my mind, in that it used an extended cast of recurring characters and was a broad ensemble. It, unlike most all shows beforehand, didn’t have a strictly defined cast of 4 or 5 people. They also had a pretty wide range of characters that made frequent short appearances, this was pretty rare. On The Cosby Show, when one of Theo’s friends showed up or one of the boyfriends the show revolved around them. On Cheers any one of the lesser bar patrons could pop in with a one-liner and be gone. This led the way to guys like Newman, Jackie Childs and the wide cast of characters you’d see in passing to add depth to each episode.
Cheers succeeding in being a show where the characters were more important than the plots, though it still had a bit of a formula. Seinfeld did away with it all and made it wholly about characters without any limitation of formula or situation. The step Seinfeld took was a bigger and more significant than the one Cheers did.