No person shall be employed or regularly assigned under any title not appropriate to the duties to be performed. In positions encompassing several duties of comparable levels of difficulty and requiring similar qualifications, the appropriate title will reflect the preponderant duties. In positions encompassing related duties of substantially varying levels of difficulty, the appropriate titling shall reflect the most difficult duties required if such duties are performed to a substantial degree.
The cooperation of each department head and division head is essential for maintaining the integrity of the classification plan by limiting employees to the performance of duties appropriate to their class, or notifying the Commission upon the assignment of inappropriate duties.