This necessity means that the parties desiring to enter into contracts meet all requirements.

A contract in which the parties express their intentions, either orally or in writing, at the time of the agreement.

The terms of this contract are implied by acts or conduct of the parties.

Those contracts in which the parties have fulfilled the terms.

This is an agreement which is not in the form required by law.

A contract that would be an enforceable agreement, but due to circumstances, may be set aside by one of the parties.

Involves obtaining consent by means of threat to do harm to the person, his family, or his property.

If one person makes a promise to another and the other acts upon the promise, the promisor will not be permitted to claim lack of consideration according to the principle of:

The annulment or cancellation of an instrument, act, or promise by one doing or making it.

The improper influence that is asserted by one dominent person over another, without the threat or harm.