Range - Checks whether data is within a certain range. For example, checks whether a number is between 1 and 10., Valid Choice - Checks whether the user has entered a value from within a list of choices. For example, ‘yes’, ‘no’ or ‘A’, ‘B’, ‘C’, ‘D’., Length - Checks the length of a value given by the user. For example, checks if a user has typed in enough values for a post-code., Presence - Whether a value has been entered. For example, if a name is required, the validation will check that the user has typed a value., Lookup - whether a value is within a pre-defined list of values. For example, the user has to enter a username, the algorithm will check a list to check this,

Forms of Validation

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