Wallpaper hangers need knowledge in the following areas:

• Customer and Personal Service: Providing special services to customers based on their needs.
• Building and Construction: The tools and methods used to construct buildings, roads, and other structures.
• Mathematics: The rules and uses of numbers.
• Mechanical: The design, use, and repair of machines and tools.
• Administration and Management: How to run a business or group.
• Public Safety and Security: How to protect people and property.