Interior designers need knowledge in the following areas:

• Design: Making and using plans, blueprints, drawings, and models.
• Building and Construction: The tools and methods used to construct buildings, roads, and other structures.
• 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.
• Fine Arts: The methods and concepts needed to create visual, music, or dramatic arts.
• Sales and Marketing: The methods for selling products and services.
• Public Safety and Security: How to protect people and property.
• Computers and Electronics: Computer hardware and software.
• Psychology: People, their actions, and mental processes and how to treat problems.
• Mathematics: The rules and uses of numbers.
• Communications and Media: How to produce written, spoken or visual media.
• Engineering and Technology: How to use computers and rules of engineering to design and produce goods and services.
• Clerical: General office work such as filling and storing information.