Integrity as a concept has to do with perceived consistency of actions, values, methods, measures, principles, expectations and outcome. People use integrity as a holistic concept, judging the integrity of systems in terms of those systems' ability to achieve their own goals (if any). A value system's abstraction depth and range of applicable interaction may also function as significant factors in identifying integrity due to their congruence or lack of congruence with empirical observation. A value system may evolve over time while retaining integrity if those who espouse the values account for and resolve inconsistencies. Some people see integrity as the quality of having a sense of honesty and truthfulness in regard to the motivations for one's actions. Some people[who?] use the term "hypocrisy" in contrast to integrity[citation needed] for asserting that one part of a value system demonstrably conflicts with another, and to demand that the parties holding apparently conflicting values account for the discrepancy or change their beliefs to improve internal consistency (seen as a virtue).