Perhaps the two most serious problems with job evaluation ratings are subjectivity and the rapidity with which jobs fundamentally change, both of which can cause inaccurate and unreliable ratings. In order to minimize subjectivity, the rating scales used to evaluate jobs must be clearly defined, and evaluators should be thoroughly trained on how to use them. Moreover, the evaluators should be provided with complete, accurate, and up-to-date job descriptions. The second issue is more difficult to address. Due largely to changes in technology, jobs now change so rapidly and so fundamentally that evaluation results quickly become out of date.