Martin Seligman is one of the founding fathers of the Positive Psychology movement and this is the third Note we’ve done on one of his books. (Check out the Notes on his other classics: Learned Optimism and Authentic Happiness for more science of happiness goodness.) In this Note, we’ll explore his shift from Authentic Happiness Theory to Well-Being Theory as we wrap our brains around PERMA, his model of well-being that consists of Positive emotions + Engagement + Relationships + Meaning + Achievement. Good times.