Question 1 Complete Marked out of 0.50 Consideration is required to discharge an agreement by Unilateral agreement Mutual agreement . Waiver . Estoppel Question 2 Complete Marked out of 0.50 Legislation requires that some contracts will only be enforceable if they are in writing. Such contracts: Do not require writing for either discharge or variation ' Can be varied orally but must be discharged in writing . Can be discharged orally but must be varied in writing. . Require writing for both discharge and variation