People change because they want to, not because someone else wants them to. They either change because they see the light or they feel the heat. Without accurate feedback on their behaviour neither of these things is possible.
Change proceeds best from an AT (Ask Them) approach rather that a TT (Tell Them) approach. As Winston Churchill so nicely put it, “Personally I’m always ready to learn, although I don’t always like being taught.”
Asking people what they should do to improve performance is far more effective than telling them. But to get a clear answer requires our sophisticated behavioural technology.