The effects of two kinds of expectancies, ability, and the interactions of these variables on the performance of a laboratory task were determined using undergraduate college students as subjects. The two expectancies were: (1) the beliefs that individuals have about whether the expenditure of effort will result in "effective" performance (Expectancy I), and (2) the beliefs that people have concerning whether being an "effective" performer will lead to valued rewards (Expectancy II). Ability proved to be the variable that was most predictive of performance. However, Expectancy I showed a significant linear relationship (p < .05) to performance. Neither the Expectancy II variable nor any of the interactions were significant. It was also demonstrated that individuals who value a reward perform at higher levels than individuals who do not value the reward as much.