“…Happiness is an "abstract concept", like joy, pain, culture, and belief, and people have different understandings of "happiness" from different angles. A product's happiness level is divided into four major elements: cognitive happiness, perceived happiness, physiological happiness, and sensory happiness [7]. In the happiness design, the positive influences on human beings are taken as the motivation, and the factors of happiness design are discussed, as follows: favorable to human needs, life expectation, meaningful and valuable, satisfactory evaluation of emotion and life, makes people have positive effect and supportive feelings, can be tasted and enjoyed, is not a temporary pleasure, interacts with people, can obtain a sense of accomplishment, design has meaning, connotation, and affiliation, enlightens, is an experience, inspires people to be good and have the same experience as others, is activating, tasteful, and reminds people to do something, enables people to achieve their goals, and is thoughtful, satisfying, and ethical [11,12].…”