Personnel Systems Because of the links between the payroll and the personnel departments their computer systems tend to work closely with each other. In some cases personnel systems incorporate payroll/ as part of their functions. However, it is more common to have separate systems because each has its own goals and objectivesPersonnel Systems ◼ Because of the links between the payroll and the personnel departments, their computer systems tend to work closely with each other. In some cases, personnel systems incorporate payroll as part of their functions. However, it is more common to have separate systems because each has its own goals and objectives