Buyers and purchasing agents need knowledge in the following areas:

• English Language: The meaning and use of the English language.
• Customer and Personal Service: Providing special services to customers based on their needs.
• Mathematics: The rules and uses of numbers.
• Administration and Management: How to run a business or group.
• Economics and Accounting: Banking and business.
• Computers and Electronics: Computer hardware and software.
• Sales and Marketing: The methods for selling products and services.
• Production and Processing: How products are made and distributed.