This document discusses ways to increase happiness and proposes that 40% of happiness comes from intentional activities. It introduces a framework with four dimensions - abandon, efficiency, engagement, and predictability - for designing happy interactions. Each dimension has opposing states that can be encouraged through different design principles like establishing trust, empowering people, and encouraging discovery. The goal is to design interactions that increase positive affect, decrease negative affect, and increase life satisfaction to improve subjective well-being. The conclusion is that happiness in the world can be increased through positive design of individual interactions and experiences.