Quote: Dave M @ December 17, 2007, 1:44 PMThe best example, that I've heard, of the difference between a comedy drama and a sitcom is that the characters in sitcom never change because they never learn from experience unlike those in a comedy drama.
I wouldn't say that was the best example I've heard. Nighty Night, Gavin & Stacey, Extras and even the later parts of the Office show the characters changing as they learn more about each other and their experiences.
The generic definition is that a sitcom is half an hour and a comedy drama is anything more. Although Viv Vyle bucked that trend as that was as near to a 30 minute comedy drama as you can get. Basically a comedy drama usually has a balance between gags and drama (that's why its usually an hour) while a sitcom is gag-heavy with less drama (squeezed into 30 minutes).
Oh and a sitcom doesn't become a comedy drama if you don't think the gags are funny. That's just a bad sitcom.