"Big Bang Theory" to Thursday, reality hit "Survivor" to Wednesday, David Caruso's "CSI: Miami" to Sunday and "CSI: NY" to Friday. Massive changes being made to CBC's schedule have left everyone open-jawed.

With the most startling moves of any network for the coming season, centered not on picking up new shows but on shifting several of its most popular series to new nights, CBS is now destined to either mess up things or shoot up to great heights.

While CBS's scheduling chief Kelly Kahl calls it the network circle of life, she says she is surprisingly surprised to see that everyone else is so surprised with the move.

In what is arguably the biggest change from the 2009-10 season, CBS is moving the comedy "The Big Bang Theory" to 8 p. m. Eastern time Thursday from 9:30 p. m. Monday, jump-starting a new hour long comedy block. "Big Bang," now in its third season, is the highest-rated sitcom on television among adults ages 18 to 49, the audience advertisers most covet.

While some are amazed at the aggressiveness of the CBS schedule, others worry if they will be able to find time to watch their favorites. The new time slot for "Big Bang" is "a risky move but is an intelligent move, they hope that the audience is able to migrate.

Executives at CBS, part of the CBS Corporation, characterized the strategy behind the line-up for 2010-11 as "aggressive stability."

If you are going to walk into a new night with comedy, you better come in with big guns - and that's what we've done," Kelly Kahl, the Chief Scheduler for CBS, said at a breakfast briefing for reporters.