Abstract
This chapter investigates the basic law on the certainty and intention requirements in the creation of an agreement. To be legally enforceable as a contract, the agreement must be sufficiently certain and show an intention to enter a legal relationship. Agreements can be uncertain because they are vague, or because they are incomplete. This can indicate there was no intention to enter a legal relationship. The courts must not rewrite the agreement; they must simply interpret it. If an agreement is incomplete, the courts may decide that the missing terms are implied, and this is more likely if there has been performance. A gap in an incomplete agreement can be filled if the parties have provided a mechanism for doing so, or if the terms can be construed so as to do so. The chapter then differentiates between an agreement to negotiate (a lock-in agreement) and agreements not to negotiate with other parties (lock-out agreements). Agreements between businesses are presumed to be made with the intention to be legally binding, but the facts, the interpretation of the terms, or the surrounding circumstances could mean there was no such intention.
