Range - This checks to see if the data input lies between an acceptable upper value and an acceptable lower value, Type/character - This checks to see if the data entered is of thecorrect type (i.e. letter or number only), Length - This checks to see if the data input contains the required number of characters only, Format - This checks to see if the data input is in the correct format, Presence - This checks that data has been entered into a field and it has not been left empty, Check digit - This is an extra digit added to a number which has been calculated from the other digits,

Validation routine

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