The staff attached to individual line officers are called personal staff. The primary duty of a personal staff is to perform routine functions of line executive and helps line executive in providing necessary information. The best examples of personal staffs are private assistants (PA) or Private Secretary.
Specialist staffs are technically qualified staff who provide service to the entire organisation. These staff are expertise in their respective field of operation. They help line executives in planning and control. The examples of specialist staff are system analysts, O and M staff and legal advisors.