In common law systems, contracts are generally formed when there is an offer, acceptance, and consideration. The exchange of promises between the parties is what creates the legally binding agreement.

In civil law systems, contract law is primarily governed by comprehensive codes, such as the French Civil Code or the German Civil Code. These codes provide detailed rules and principles that govern the formation, interpretation, and enforcement of contracts.

In civil law systems, the primary goal of contract interpretation is to determine the true intent of the parties. Courts will consider the circumstances surrounding the formation of the contract, as well as the language used in the contract, to determine the parties' intentions.

In common law systems, the general rule is that contracts must be performed in good faith. This means that the parties must act honestly and fairly towards each other in the performance of their contractual obligations.

In civil law systems, the primary remedy for breach of contract is damages. Damages are intended to compensate the non-breaching party for the losses suffered as a result of the breach.

The principle of good faith is a fundamental principle in many civil law systems. It requires parties to act in good faith towards each other in all aspects of the contractual relationship, including the negotiation, formation, and performance of the contract.

In common law systems, the primary purpose of contract law is to protect the rights of the parties to the contract. This includes the right to enter into a contract, the right to have the contract performed as agreed, and the right to seek remedies for breach of contract.

In common law systems, the doctrine of mistake of fact allows a party to avoid a contract if they entered into the contract based on a mistaken belief about a material fact.

In civil law systems, the primary function of a contract is to create a legal obligation between the parties. This obligation is enforceable by law and gives rise to rights and duties for both parties.

In civil law systems, the primary remedy for breach of contract is damages. Damages are intended to compensate the non-breaching party for the losses suffered as a result of the breach.

In civil law systems, contracts are generally enforceable even if they are not in writing. However, certain types of contracts, such as contracts for the sale of real estate, may require a written form to be enforceable.

In common law systems, the plain meaning rule is a principle of contract interpretation that states that the words of a contract should be given their ordinary and usual meaning.

In civil law systems, the primary source of law governing the formation of contracts is comprehensive codes, such as the French Civil Code or the German Civil Code. These codes provide detailed rules and principles that govern the formation, interpretation, and enforcement of contracts.

In common law systems, consideration is a fundamental requirement for the enforceability of a contract. Consideration is something of value that is exchanged between the parties to the contract.

In common law systems, contracts can be terminated by mutual agreement, performance, breach, or frustration.