The binding principles established are: (1) In a claim based on a contract, the plaintiff bears the onus of proving the existence of the contract, its binding nature and enforceability on a balance of probabilities; (2) Where the authenticity of a signature on a contract is disputed, the party alleging authenticity must substantiate this through proper evidence, preferably expert evidence from a qualified questioned documents examiner, not mere comparison by a lay witness; (3) Hearsay evidence from witnesses who have no personal knowledge of the material facts and were not present at the conclusion of the alleged contract is of little probative value when the existence of the contract is in dispute; (4) The absence of a key witness (such as the actual party to the contract) without adequate explanation may be fatal to a claim, particularly when that witness is reasonably accessible; (5) The principle that he who alleges must prove cannot be shifted to the defendant to disprove the plaintiff's case; (6) A party cannot raise a new claim for substantive relief (such as a declaration of nullity) in closing submissions without having filed a counterclaim.