They learn to work well with other people in the buildings they clean and to work without supervision. Instruction in minor electrical, plumbing, and other repairs may also be given. Chances for advancement are usually limited in organizations where they are the only maintenance workers. Where there is a large maintenance staff, however, janitors can be promoted to supervisor and to area supervisor or manager. A high school diploma improves the chances for advancement.
Supervisors usually move up through the ranks.
In many establishments, they are required to take some extra training. This training is to improve housekeeping techniques and procedures and to enhance supervisory skills.