But the House of Lords has gone on to say that it is possible that such agreements will exclude all claims, including those that are not even taken into consideration, provided that the agreement uses clear language to that effect, and that is the intention of the parties. ACAS is an advisory conciliation and arbitration service. ACAS doesn`t have to play a role in your settlement agreement, but they do offer employers and workers a free mediation and counselling service over the phone. It is similar to the purpose of a transaction agreement, although the wording of a COT3 tends to be more succinct. Just as a settlement agreement prevents an employee from asserting rights before the labour court, a COT3 draws a line under the duties collected and can also prevent other claims from being sued in court.