This technique of the small transgression applies within the framework of a more complex scenario.
The anorexic teenager is in great danger compared to her weight. So we start the session by telling her that she either follows us or she goes to the hospital. We have to get her to understand that it's very important for her to work with us (we're dealing with teenage girls who show great resistance) by showing the hospital alternative in a horrible light: absorption of nutrients by through pipes in the nose.
This creates greater fear.
