What will happen if the parties set certain contractual terms, but make it clear that other conditions still need to be agreed? In a sense, it is a cross between Scenario 1 and Scenario 3. However, in this context, the courts have expressed an increased desire for the parties to respect their agreement in order to continue negotiations for a new agreement. Duress has been defined as a “threat of harm that is made to force a person to do something against his will or judgment; esp., an illegitimate threat made by one person to force a manifestation of another person`s apparent consent to a transaction without real will.  An example is Barton v Armstrong  in a person who has been threatened with death if he does not sign the treaty. An innocent party wishing to impose a contract of coercion on the person only has to prove that the threat was made and that it was one of the reasons for entering the contract; the burden of proof then rests with the other party to prove that the threat had no effect on the performance of the contract by the party. There may also be constraints on goods and sometimes “economic constraints.” Many contracts contain a forum selection clause that defines how treaty disputes should be resolved. The clause may be general and require that all actions arising from the contract be filed in a particular country or country, or it may require that a case be brought before a particular court. For example, a selection of forum clauses may require a case to be filed in the State of California, or it may be necessary to refer the case to the Superior Court for Los Angeles County. If both parties have clearly expressed their intention to enter into a contract and indicated the terms of that agreement, the contract is legally binding, whether oral or written. However, oral contracts can be problematic when one party refuses the terms invoked by the other party. Written contracts may consist of a standard agreement or a letter of confirmation of the agreement. Most business service contracts (unlike contracts for goods) are defined by the common law — a series of laws on judges based on traditions, but constantly evolving, that arise mainly from previous court decisions.