For contract acceptance to occur an offer has to be made and this has to be a clearly communicated offer of entering into a contract. For example, where the offeror of the contact signed a standard and set of pre-printed
contractual terms with indication to the other party that he also has to sign the document if he want to proceed. If the document is clear and had no ambiguity, then it is enforceable when it has been signed by offeree and offeror. A statement of invitation to negotiate contractual terms cannot be deemed to be an offer. In addition, advertisement with no promissory results or effects cannot be enforced. Moreover, if the contract has not been accepted the person to whom the offer was made, the offeror of the contract can withdraw it. Furthermore, the offer is made subject to time.