It is very sad about Valerie Harper, but to answer a question from earlier, it wasn't Valerie that was the problem, it was her manager/husband. He caused way too much trouble for the show. Brandon Tartikoff asked her to keep him away, she wouldn't and the trouble escalated. They gave her an ultimatum to get rid of him or lose the show. She stuck with him, and Brandon fired her. At that time Sandy Duncan had filmed a new pilot titled Act Two for NBC and was waiting for confirmation to be picked up. Brandon made the offer to Sandy's manager to have her take the series. They dangled a very expensive ($50K) diamond bracelet in front of her at lunch and by that afternoon the deal was set. As for her pilot, there was room for only one more comedy with kids in it on the schedule so they picked up a weak comedy series starring Haley Mills based on the comic strip Good Morning Miss Peach that Sandy initially turned down. The weak series was titled, Saved By the Bell. Valerie never carried a series again. So sad. She is extremely talented.