In this chapter written by Joan Duda and Isabel Balaguer, the impact of coach’s on their athletes’ motivation and self-perception is examined. The chapter is opened with numbering off qualities and attributes that coaches should possess to create a positive motivational climate, such as an understanding of how athletes may best execute skills in their sport and maximize training times by teaching effectively (Duda, Balaguer, 2007). Duda and Balaguer go on to describe the three basic tenets of the Achievement Goal Theory, and explain the original groundwork of the theory that gave shape to its modern form; the specific concept that is highlighted in this chapter and used throughout the book is the differentiation between ego and task goal