Janitor and housekeeper supervisors need knowledge in the following areas:

• Customer and Personal Service: Providing special services to customers based on their needs.
• English Language: The meaning and use of the English language.
• Administration and Management: How to run a business or group.
• Education and Training: The methods of teaching and learning.
• Public Safety and Security: How to protect people and property.
• Personnel and Human Resources: The policies to hire and retain employees.
• Clerical: General office work such as filling and storing information.