After both sides have found the median ground that benefits both sides, an acceptance of the contract by both sides can begin. The acceptance process will involve finalizing the contract by all of the involved parties signing the contract. A third party witness or notarization of the document may also be required to make the document binding. However, this greatly depends of the type of contract you are dealing with, and how much security you desire. For example the sale of property will need to be notarized.