If you want an agreement to be enforceable, get it in writing. Of course, coming from an attorney, you probably expect that advice. However this little pearl of wisdom would not be repeated so often if it weren’t useful. Legally, promises or agreements that you exchange with another are classified as contracts and certain types of contracts can be unenforceable if they are not in writing. This principle is known as the Statute of Frauds and prevents one from simply inventing agreements or terms that were never actually agreed upon. Sterling v. Taylor, 40 Cal.