Small Claim court is a special court where disputes are resolved quickly and inexpensively. The rules are simple and informal. The person who sues is called the “plaintiff.” The person who is being sued is called the “defendant.” Neither party can be represented by a lawyer. An individual can sue another individual or a business, but may not file a claim against a federal agency. A business, in turn, can sue an individual or another business. In order to file or defend a case in small claims court, you must be at least 18 years old and be mentally competent.