Perceived ease of use is hypothesized to have a significant direct effect on perceived usefulness, since, all else being equal, a system which is easier to use will result in increased job performance (i.e., greater usefulness) for the user. Given that a non-trivial fraction of a user's total job content is devoted to physically using the system perase, if the user becomes more productive in that fraction of his or her job via greater ease of use, then he or she becomes more productive overall. Thus, characteristics of the system may indirectly influence usefulness by affecting ease of use.