The "upper class" —represented by characters like Diane Chambers, Frasier Crane and Lilith Sternin— rubbed shoulders with middle- and working-class characters —Sam Malone, Carla Tortelli, Norm Peterson and Cliff Clavin. An extreme example of this was the relationship between Woody Boyd and a millionaire's daughter, Kelly Gaines. Many viewers enjoyed Cheers in part because of this focus on character development in addition to plot development.[1]