There are many theories about motivation from different aspects that study some phenomenon in working circumstances such as the arousal or energizing of the organism and the direction of behavior. (Vroom, 1984, p.8) Just like many important concepts in psychology, there is no single universally accepted definition of motivation. Arnold (2005, P.309) considered that “Motivation concerns what drives a person’s choice of what to do, and how long they keep trying. It is NOT the only factor that influences work performance”. And Mullins (2013, p.245) indicated that motivation can be described as the direction and persistence of action. However, no matter how different they are, three components are common: the direction (what a person is trying to do), the effort (how hard a person is trying) and the persistence (how long a person continues trying). All the theories can be categorised in two different types: the process theories which focus on the process of behaviour, and the content theories which lay stress on the factors that motivate people. In this essay, Vroom’s Expectancy Theory and Herzberg’s two-factor theory are reviewed separately.
Vroom’s Expectancy Theory
Expectancy theory is one of the process theories originally proposed by Vroom. This theory brings out a framework for learning about how people make choices according to their expectations. In this theory, there are three concepts, or factors, to be taken into consideration. The first one is Valence, which refers to affective orientation toward particular outcomes, for example, the question ‘how much do I value those outcomes’; (Vroom, 1984, p.15) the second factor is Expectancy, which is defined as a momentary belief concerning the likelihood that a particular act will be followed by a particular outcome, for example, the question ‘would I be able to perform the action I am considering if I tried’; (Vroom, 1984, p.17) the third one is Instrumentality, from
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