Chapter 13 Tools A B Contract that is not formal Simple Contract Contracts in which the agreement is stated in written or spoken words Express Contract Rule the bars use of prior written or spoken words to alter a written contract that appears to be complete Parol Evidence Contract that is fully performed Executed Contract Written contract that must be in a apecial form to be enforceable Formal Contract Contract in which intent is shown by conduct and circumstances Implied Contract Contract that has not been fully preformed Executory Contract Circumstances under which, to prevent unjust enrichment, parties are bound as in a vaild contract Quasi Contract Law requiring certain contracts to be in writing and signed by the defendant in order to be enforceable Statue of Frauds