Correlation between actual expertise and job classes is out of whack, and badly needs to be inventoried and re-synchronized to restore a sense of fairness among non-management employees. Performance ratings depend not only on your own manager, but the assessments of other managers who you don't necessarily report to. Whether you get a promotion requires consent of all division managers. Work can be extremely compartmentalized so that skills are not well-rounded and balanced...which has prevented some employees from earning a promotion, only available to someone who acquires a complete skillset. The delegation of responsibilities does not support balanced skills growth.