The Four Tendencies are part of what I discuss in Better Than Before, my book on habit change.
A key piece of self-knowledge - which is crucial to habit change - is "What is your 'Tendency'?" That is: How do you respond to expectations?
Outer expectations: Meet a deadline, perform a "request" from a sweetheart, follow traffic regulations
Inner expectations: Write a novel in your free time, keep a New Year's resolution, start flossing