| A | B |
| parol evidence rule | rule under which a written contract cannot be changes by prior oral or written agreements |
| express contract | contract in which the agreement of the parties is spoken or written |
| formal contract | writen contract that must be in a special form to be enforced |
| executed contract | contract that has been fully performed |
| simple contract | any contract that is not a formal contract |
| implied contract | contract in which intent of the parties is shown by conduct or circumstances |
| quasi contract | obligation that is enforced as if it were a contract in order to prevent unjust enrichment of one party |
| statute of frauds | law stating that certain agreements are not enforceable unless they are in writing and are signed by the party against whom the contract to be enforced |
| executory contract | contract that has not been fully performed |
| contract of adhesion | contract in which the more powerful party dictates all the important terms |