Tortious interference is a legal theory intended to allow parties to contract to fulfill contractual obligations without thirdparty interference. If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option.Wrongful interference with a contractual relationship occurs when:1) A valid and enforceable contract exists between two parties. If a third party interferes with a contract or business relationship, it may be tortious interference in a business relationship. Intentional Interference with Contractual Relations. Defendant is liable for actual damages or difference in value of chattel pre – post trespass. TORT: To commit a tort is to act in a manner that is wrongful and injurious toward another. Arises with the Contractor. The Contractor agrees that any such payment would not be an interference with contractual relations. There is no useful general definition of "tort" or "tortious conduct.