How do reality show producers keep a series unpredictable?

How do reality show producers keep a series unpredictable?

Mark Cronin (Founder & Producer) gives expert video advice on: What do producers look for when casting reality game shows?; Do reality show cast members get paid? and more...

Often, if you're going for a second season of a show, you can be quite sure you know pretty well what the show is. We always try to throw in some kind of twists and turns, even in second, third and fourth seasons of shows. But in general if you've seen it on TV and it was successful, they're trying to do the same show to feed the same audience, so it's not going to change drastically.