This chapter discusses diversity in organizations. It describes the two major forms of workforce diversity as surface-level diversity, based on visible characteristics, and deep-level diversity, based on invisible characteristics and attributes. The chapter then outlines key biographical characteristics like age, gender, race, and disability that impact organizational behavior. It also defines intellectual and physical ability, and how ability is relevant to job performance. Finally, it describes how organizations can effectively manage diversity through programs that attract, select, develop, and retain a diverse workforce.