Perceived usefulness is defined her as "the degree to which a person believes that using a particular system would enhance his or her job performance." This follow from the definition of the word useful: "capable of being used advantageously." Within an organizational context, people are generally reinforced for good performance by raises, promotions, bonuses,and other rewards. A system high in perceived usefulness, in turn, is one for which a user believes in the existence of a positive use-performance relationship