With season two, the series moved up an hour to the Wednesday 9:00pm time slot, where it stayed for three years. During that time, the series competed with such popular shows as "One Day at a Time", "The Jeffersons", and "Diff'rent Strokes". The transition from Fawcett to Cheryl Ladd in the second season proved to be popular with viewers. While viewership dipped marginally in the second season, the series still remained in the top five for the 1977–78 season, placing fourth in the ratings, tying with "60 Minutes" and "All in the Family". In the third season, viewership stabilized, but the series began losing traction as it ranked twelfth behind newcomers "Mork & Mindy", "The Ropers", and "Taxi" for the 1978–79 season. With Jackson's departure and Shelley Hack entering the cast, the show's fourth season saw some ratings erosion as it ranked twentieth for the 1979–80 season, tying with "Barney Miller".