"The requisite elements that must be established to demonstrate the formation of a legally binding contract are (1) offer; (2) acceptance; (3) consideration; (4) mutuality of obligation; (5) competency and capacity; and, in certain circumstances, (6) a written instrument..."
Original Source: US Legal
"The requisite elements that must be established to demonstrate the formation of a legally binding contract are (1) offer; (2) acceptance; (3) consideration; (4) mutuality of obligation; (5) competency and capacity; and, in certain circumstances, (6) a written instrument..."
http://contracts.uslegal.com/elements-of-a-contract