Prof. Robert Kegan questions why there is a gap between a person's real intention to change and what the person actually does. He recalls an illustration in which heart doctors advise their patients to take their medications as prescribed or they would die. The follow up research shows that only 1/7 actually go on to take their medications. The other six have just as great a desire to stay alive and yet risk death by not following their doctor's advice.
Kegan proposes that there is a deep need for us to understand what it is that gets in the way of a person's genuine intention and what they can actually bring about. He looks at how we might address this gap, which he refers to as an 'Immunity to Change'.