In most cases, a contract is binding in Arizona even if the parties signed it in another state. An example of an unenforceable contract under Arizona law is a contract for the sale of real estate (a house or land) that is not made in writing.Do you find that your contract process and your contract terms are full of legal jargon? This ever-expanding list demystifies contract terminology for you. Contract law involves the determination of when certain promises are enforceable and the rights and obligations of the parties to a contract. This page provides links to tax treaties between the United States and particular countries. This certificate program explores the many different aspects of contracts. You will investigate the creation of enforceable agreements. Under Sri Lankan law a written signature is not necessarily required for a valid contract. A contract is an agreement that specifies certain legally enforceable rights and obligations pertaining to two or more parties.