How much information do reality show producers give their cast?
This depends on the show. Some shows have been very, very, deceptive, and have even given false descriptions of the show that you think you're being cast for, and then it turns out it's something else. That doesn't happen as much anymore, and people are much more savvy about it. There may have been some legal cases, but it doesn't happen as much anymore, that people are cast under false pretenses. It is possible, though, that they won't tell you very much. And it is usually because they're trying to protect the surprise factor, which is a big part of the entertainment. If you knew everything about the show going in, it's less entertaining to watch you discover what's going on. A big part of reality television is surprising the cast with the next challenge, or a plot twist of some sort. For example, the tribes are going to merge, but nobody knows when. The less the cast knows in general, the better for the producers and for the audience.