(a) the various duties required of the Department may be assigned to appropriate divisions to be performed by persons experienced and qualified for such respective kinds of work;

(b) the duties of police officers are coordinated so that when an officer is not engaged in particular duty specified or directed to be done, or not then requiring attention, such officer shall perform the other duties required by the Department; and

(c) the cooperation of other officers and employees may be secured for the purposes of avoiding duplication of time and effort.