Blind and double blind training can be very simple, and can be made complex. Let's start with simple. The basics of either (blind or double blind) are the same:
someone besides the handler sets the problem.
anyone who has knowledge about the set (how many hides, where they are) keeps that information to themselves.
Here's where the difference comes in: if it is a blind problem, someone with knowledge about the solution to the problem may be present and they provide no information to the handler that might bias the outcome. They may stand on the sideline, they may walk along with the team, they may be anywhere nearby. In a double-blind problem all individuals with knowledge of the solution to the set, in whole or in part, are out of the area. In double blind there isn't a way for the handler to recieve any information that would help them solve the...