This guide is designed to alert readers to the scope and variety of programming coming up. Listing is not meant to represent blanket endorsement. Viewers are urged to be selective. FRIDAY Celebrating Gershwin: 'S Wonderful (PBS, 9-11 p.m.): ``Great Performances'' presents Part 2 of a survey of George Gershwin's career, highlighting his music of the '30s.
SATURDAY The Frugal Gourmet: A Colonial Christmas With Friends (PBS, 7-7:48 p.m.): Chef Jeff Smith prepares traditional Christmas sweets. The Children of Apartheid (CBS, 8-9 p.m.): (See preview on Page 21.)
SUNDAY Tiger! (PBS, 8-9 p.m.): ``Nature'' presents a uniquely intimate documentary on the life of a tiger family in India's Kanha National Park. A Hobo's Christmas (CBS, 9-11 p.m.): Barnard Hughes stars in still another heartwarming Christmas reunion tale. Northanger Abbey (PBS, 9-10:30 p.m.): ``Masterpiece Theatre'' presents a Gothic-like mystery special adapted from the Jane Austen novel. Jennings/Koppel Report: The Summit in America (ABC, 10-11 p.m.): Two incisive newsmen analyze the impact of the US-Soviet nuclear weapons accord. The Next President (Syndicated/check local listings for time and station): David Frost interviews Vice-President George Bush in second of 13-week series on presidents and candidates.
MONDAY The True Gift of Christmas (PBS, 8-9 p.m.): International ice-skating stars present the myths and music of Christmas. Eye on the Sparrow (NBC, 8:30-10:30 p.m.): Fact-based drama about blind couple's fight to adopt a child. The Summit (PBS, 9-11 p.m.): Marvin Kalb anchors live a look at the current summit as well as a historic look at previous ones, especially the 1986 Reykjavik meeting. Guests include Soviet and American experts.
TUESDAY Barbara Walters Interviews (ABC, 9-10 p.m.): Eddie Murphy, Don Johnson, and Sean Connery get the Walters treatment.
WEDNESDAY Discover: The World of Science (PBS, 8-9 p.m.): Excellent science magazine show investigates dolphins, Egyptian tombs, and obesity. Nobel Peace Prize Awards (WTBS/cable, 10:05 p.m.-12:05 a.m.): Ceremonies from Stockholm. Moyers: God and Politics (PBS, 9-10:30 p.m.): First of three-part series probing how religious beliefs shape political events. Like all Moyers work, it must be watched. Circle of Plenty (PBS, 10:30-11 p.m.): Examining Project Common Ground, a practical plan to use small-scale agriculture to help alleviate world hunger.
THURSDAY Agatha Christie's Miss Marple: Nemesis (PBS, 9-10 p.m.): Part 1 of two-part ``Mystery!'' series based on Christie's famous amateur sleuth.
Listings are in Eastern time.