range check - checks that the value entered is between an upper value and a lower value, presence check - checks that some data is entered, length check - checks that there is the correct number of characters in the entered data, type check - checks that the data is of the correct type, e.g. all numbers, lookup check - checks to see if the data entered exists in a list or database, check digit - checks to see if a final digit matches one calculated by a predetermined algorithm,

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