Tortious interference occurs when a third party disrupts an existing or prospective business relationship between two or more other parties. Tortious interference with a contract occurs when a third party intentionally damages the contractual between two parties.Wrongful or tortious interference with contracts happens when a thirdparty intentionally causes a contracting party to commit a breach of contract. Wrongful interference with a contractual relationship occurs when:1) A valid and enforceable contract exists between two parties. COMMENT: Defining Improper Conduct. In the Wagenseller case, the supreme court ruled that improper conduct was an element of interference with contract cases. If a third party interferes with a contract, the third party may be liable for money damages resulting from his interference. Such primary torts or violations may include fraud, breach of fiduciary duty, and intentional interference with a business relationship or expectancy. Both involve situations where one party does something to intentionally undermine another party's business transactions or relationships. Wrongful interference with a contractual relationship requires that there is a valid contract between two parties, a third party who knows the contract exists.