Montgomery Commission employees are divided into two bargaining units: the office/professional/technical unit; and the service/labor/trade unit. The office/professional/technical unit includes: office classification titles in which employees are responsible for communications, recording and retrieving information, and paperwork required in an office; 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; 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 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. The service/labor/trade unit includes: classification titles in which employees: perform service and maintenance; may operate specialized machinery or heavy equipment; and have duties that contribute to the comfort and convenience of the public or to the upkeep and care of Montgomery Commission buildings, facilities, or grounds; and 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.