This course examines the basis upon which the enforcement of supposed contractual obligations might be resisted in terms of principle, evidence and the strategy and tactics of litigation. Topics include the rules of common law, equity, statutory obligations; contract law, including validity, enforceability, variation, abandonment, replacement, frustration, misrepresentation, duress and mistake, estoppel, election, waiver, penalties and forfeitures. In addition, implied contracts and implied terms, whether by law, custom or usage will be examined, as well as rectification of contracts, and the consequences of defective performance by a plaintiff.