Athletes with disabilities can perform more consistently and come closer to their potential if they maximize their mental skills as well as their physical skills. The purpose of this chapter is to present of humanistic developmental model of psychological skills training and an examination of disability sport psychology research on psychological skills. A humanistic developmental model prioritizes both athlete performance and well-being as they are viewed as complementary goals that exert a bidirectional influence on each other. In this model foundational factors, psychological skills and qualities, psychological methods, and facilitative and debilitative factors are seen as relatively distinct categories. Researchers have supported the importance of foundational factors, as reported in other chapters. Researchers have also supported the value of imagery and self-talk as methods to enhance confidence, motivation, and psychological skills, which in turn are positively related to performance. A host of facilitative and debilitative factors in disability sport also influence training quality and performance.