A contract which is perfected by mere consent.
Consensual
A contract which is perfected only upon delivery of the thing.
Real
A contract which require a certain form for its validity.
Formal
A contract which can stand on its own, such as a contract of sale, barter, lease or loan.
Principal
A contract which cannot stand on its own and are dependent upon other contracts for its validity.
Accessory
A contract is a means to achieving an end, such as an option contract, a contract of partnership and that of agency.
Preparatory
A contract where both parties are reciprocally obligated.
Bilateral
A contract where only one party is obliged
Unilateral
The entitlement of the other party to a prestation is dependent upon chance
Aleatory
The prestation of one party is presumed equivalent of the value of the other
Commutative
A process designated to render inefficacious a contract validly entered into and normally binding, by reason of external conditions, causing an economic prejudice to a party or his creditors.
Rescission
A primary remedy which can be availed of by the parties and does not require lesion as a ground therefore but will require non-performance or non-fulfillment of the obligation or when there is substantial breach.
Resolution
contracts which are valid until they have been annulled by proper action in court. However, they are likewise subject to ratification to cure the defect, in which case, no annulment can no longer prosper.
Voidable Contracts
This renders the contract non-existing, as if it was never entered into.
Annulment
This is a defective contracts that are valid although not binding until ratified. They are contracts that for some reason cnanot be enforced, unless ratified in the manner provided by law.
Unenforceable Contracts
A kind of uneforceable contracts which entered into in the name of a person by one who has been given no authority or legal representation, or who has acted beyond his powers.
Unathorized Contracts
contract which is either inexistent, or illegal or illicit. They are defective contracts that are invalid and therefore not binding and considered an absolute nullity and produce no effect, as if they had never beene xecuted or entered into and cannot be ratified.
Void Contracts
This contract has a particular name designated and rules particular to them.
Nominate
Such as a contract of sale, barter, lease and simple loans or mutuum with stipulation for interest
Onerous
Such as a donation and commodatum
Gratuitious or lucrative
Where one prestation is given for a benefit or service that had been rendered previously
Remuneratory
A contract which has been performed. It is a contract not covered by the Statute of Fraud
Executed
A contract which do not have particular designation.
Innominate
It involves preliminary negotiation and bargaining discussion of terms and conditions, with no arrival yet of a deinite agreement.
Negotiation (Preparation of conception or generacion)