Contracts are very detailed these days unlike the olden days Agreement in a contract is an arrangement between two or people which is enforceable by the law. When making an greenlifecenter agreement in a contract both parties have to come together and have a common understanding of the contract to be made and must have trust in each other. That is, each party must have a knowledge of what the agreement in a contract entails. It is necessary for both parties to agree on the terms .