14.2 Theories of motivation Motivation and expectancy theory Motivation (M)= perceived probability of success(Ps)XIncentive value of success(ls) This formula is called an expectancy model or expectancy- valence model It implies that people's motivation to achieve something depends on the product of their estimation of their chance of success(Ps) and the value they place on success(ls)14.2 Theories of motivation • Motivation and expectancy theory • Motivation(M) = Perceived probability of success(Ps) ×Incentive value of success(Is) • This formula is called an expectancy model, or expectancy- valence model. • It implies that people’s motivation to achieve something depends on the product of their estimation of their chance of success(Ps) and the value they place on success(Is)