Harvard developmental psychologists Robert Kegan and Lisa Laskow Lahey argue that most failed change is not a lack of willpower: we also hold a hidden commitment that works against the goal we sincerely want, like driving with one foot on the gas and one on the brake. Their four-column immunity map brings out the goal, the behaviours that undermine it, the competing commitments behind them, and the big assumptions holding it all in place. Change comes from testing those assumptions, safely and on purpose, rather than trying harder.
Kegan and Lahey spent years watching capable people fail at changes they badly wanted: the manager who meant to delegate, the executive who meant to listen. Telling them to try harder did nothing, because the problem was not effort. Each was also committed, without saying so, to something the change would threaten.
That second commitment works like an immune system. It protects you from a danger you rarely name, and it rejects anything that looks like that danger, including your own good intentions. The way through is to make it visible, column by column, until you reach the assumption at the bottom. Then you test the assumption, the way a scientist would.