To explain why goals affect achievement behaviors, researchers have advanced different theories. Locke and Latham (1990) proposed that the key components are goal choice and commitment. Goal choice includes the goal people are trying to obtain and the level at which they are trying to attain it. Goal commitment refers to how enthusiastic people are about a goal or how determined they are to achieve it. Locke and Latham identified several factors that affect goal choice and commitment, including personal-individual factors such as skill level and previous performance and social-environmental factors such as group norms and the nature of authority and feedback. Because this theory was developed and tested in organizational settings, it places strong emphasis on external factors.