(1) the office/professional/technical unit; and

(2) the service/labor/trade unit.

(1) office classification titles in which employees are responsible for communications, recording and retrieving information, and paperwork required in an office;

(2) professional classification titles in which employees have special or theoretical knowledge that usually is acquired through college training, other training that provides comparable knowledge, or work experience;

(3) paraprofessional classification titles in which employees perform, in a supportive role, some duties of a professional or technician that usually require less formal training or experience than those duties performed by those with professional or technical status; and

(4) technical classification titles in which employees have both basic scientific or technical knowledge and manual skill that are usually acquired through specialized postsecondary school education or through equivalent on-the-job training.

(1) classification titles in which employees:

(2) classification titles in which employees must have a special manual skill and thorough knowledge of processes that are acquired through on-the-job training, experience, apprenticeship, or formal training programs.