What use is hypnosis if we don’t know whether our subject is in a trance or not? He could pretend and inwardly ask himself the question: “What’s this all about, I hope it ends soon.”
Various tests help us to find out what level (depth) of trance my subject has already reached. Not all levels fulfill the same purpose of hypnosis.
The Dave Elman inductions contain various tests of the trance levels. This is another reason why it is one of the best inductions ever.
It’s not about whether a subject or hypnotist passes the test, but rather how they react to the test. This gives the hypnotist the necessary feedback for what he does afterwards and thus also a certainty for his work.