The requirements of a valid contract include all of the following except:

A valid contract is fundamental to any agreement and must meet specific criteria to be enforceable. These criteria include:

1. Competent Parties: This means that all parties involved in the contract must have the legal capacity to enter into the agreement. They must be of sound mind, not minors, and not under duress or undue influence.

2. Mutual Agreement: Also known as a "meeting of the minds," this principle requires that all parties agree to the terms of the contract. This is typically evidenced through an offer and acceptance, ensuring that both parties understand and consent to the terms.

3. Legal Purpose: A valid contract must be for a legal purpose. Contracts that involve illegal activities are not enforceable by law, as they go against public policy.

The requirement for documentation by an attorney is not a necessary condition for a valid contract. While having a lawyer draft or review a contract can be beneficial, particularly for complex agreements, it is not a legal requirement for a contract to be valid. Many contracts can be created and enforced without an attorney's involvement, as long as they comply with the fundamental elements of competence, mutual agreement, and legal purpose. Thus, this option does not belong on the list of requirements