Please don`t think this list is exhaustive, far from it, it`s just a taste of some of the most common thoughts in a treatise. It also carries the risk that if you have tried to vary a contract orally and you think you are acting under the different conditions, you may find yourself in a situation where you cannot enforce these different conditions, unless you can clearly prove that the other party acted on the contract as different (and therefore relies on the doctrine of estoppel). When negotiating contractual terms, ensure that the terms of the contract are clearly defined and agreed upon by all parties. The Court of Appeal found that the oral agreement reached with respect to the revised schedule to modify payments under the licence was not only valid, but also a waiver agreement for the NOM clause. This could include terms: what type of contract is not considered a formal contract? Some contracts may determine what to pay in the event of a breach.. . .