Defenses to a contract.

Consideration: The book states consideration is a value given in return for a promise or performance. The consideration, which must be present to make the contract, legally binding, must be something of legally sufficient value and bargained for. It's a bilateral contract it normally consists of a promise in return for a promise. Example: Lets say your mother asks you to mow her lawn and clean her house and when you complete these task she …

…and was led to believe differently. So, in other words, the court will look at prior dealings, and also what is common to that specific industry. This is common because sometimes when writing a contract, things done in the past are so common that they are forgotten to be put in or made clear in the contract. So because of this the courts will allow evidence to how the parties have acted in the past.