Publisher Summary This chapter discusses the quality of life from a motivational perspective. It is proposed that the core domains of a quality life can be viewed as motivational states that initiate and direct behavior. The core domains of a quality life have been modeled as a triangle, with a hierarchy built upon the foundation of physical well-being, material well-being, and rights. Physical well-being has a strong impact on personal development, but has no signiﬁcant impact on self-determination. Material well-being affects self-determination, but does not affect personal development. Physical and material well-being also has a direct impact on the emotional well-being, rather than having all of their impact indirectly through the intermediate levels of the hierarchy. Research, guided by a self-determination theory, has focused primarily on the social–cultural conditions that facilitate the natural processes of self-motivation and enhanced intrinsic motivation, self-regulation, and well-being. The degree to which a person is self-determined either inﬂuences or is inﬂuenced by other core domains of the quality of life and, in combination with these other core domains, inﬂuences or impacts global or overall quality-of-life status.