The Director of Human Resources Management shall be responsible for developing and maintaining a classification system for all positions in the classified service. The classification plan shall identify job titles and classification categories. The Director of Human Resources Management shall develop and maintain said classification system in accordance with the following requirements: That the same grade be applied to and the same qualification requirements be consistently required for, all positions in the same class of work based upon the similarity of assigned duties, tasks, and responsibilities; and, That the same standards be developed and applied in the review of all positions and classes of work.