Final answer:
Abraham Maslow contributed to the Human Relations Movement through his development of the hierarchy of human needs, which emphasizes the progression of needs and the potential for personal growth.
Step-by-step explanation:
Abraham Maslow made significant contributions to the Human Relations Movement through his development of the hierarchy of human needs. His hierarchy suggests that human behavior is motivated by a progression of needs, starting with basic survival needs and ending with the need for self-actualization. Maslow's ideas emphasized the positive aspects of human nature and the potential for personal growth and fulfillment.