George offered to paint Catherine's barn for $3,000. Catherine said she would accept the offer if George would paint the woodshed, too. At this point, they have made a valid and enforceable contract.

Woodshed

Informally refers to the process of practicing or improving skills in private, often used in a musical context.

Enforceable Contract

A legally binding agreement that can be upheld in court and compels parties to fulfill their contractual obligations.