Cancellation
The show initially attracted high ratings for the first few episodes, but the ratings plummeted in Season 2 with a move to Thursday nights, and the series only lasted for two seasons (both abbreviated) before the characters were rolled back into Happy Days for that program's final season. ABC determined that the show was losing too much of its lead-in, suggesting low appeal if the show were moved. This type of cancellation seemed strange in the early 1980s, but soon became a commonplace part of TV audience research.
In 2010, TV Guide Network listed the show at #17 on their list of 25 Biggest TV Blunders, arguing that Joanie and Chachi was not what viewers wanted to see and that it was the Fonz that drew viewers in to Happy Days.
Read more about this topic: Joanie Loves Chachi