This document discusses the concept of happiness and how to design for it. It begins by acknowledging common misconceptions about what brings happiness and how fleeting it can be. It then outlines four key principles for designing happiness: 1) design around a single focus goal that brings the thought of achievement, 2) design to grab attention through surprises, 3) design for stories that make people more engaged, and 4) design in a way that spreads happiness through emotional contagion. It provides the example of Coca-Cola's "Happiness Machine" that used these principles to connect youth around the world for minimal cost but high impact. The document advocates that small, well-designed acts can create big changes in promoting happiness