2. Validation Validation is a check that is carried out during the process of data entry. Validation checks are used to restrict the data that can be entered so that it complies with the data rules that have been laid down. There are several types of validation checks e.g. Data Type Presences Checks Length Checks File/Table lookups Cross Field Checks Range Checks Format Checks Check Digits Parity Checks Spell Checkers Grammar Checkers Custom Dictionaries
3. VERIFYING Verification is the process of checking that the data entered into the ICT system matches the source of data. For Example, does the personal data someone has written on an application form for a job match the data that has been inputted by a keyboard operator into a data management system. Methods: Proof Reading this involves someone checking and matching each data entry visually, it is not full proof Double Data Entry This involves two keyboard operators entering the same data, which is then compared and checked automatically to ensure that the data entries are identical this is both expensive and not full proof.
