Validation and Verification

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Validation and Verification

  1. 1. Validation and Verification<br />
  2. 2. What is validation?<br />Name 5 types of validation<br />What is verification?<br />Give an example to illustrate the difference between validation and verification.<br />Learning objectives with a TWIST<br />
  3. 3. A method of checking data as it is entered, to reduce the number of errors.<br />A Validation Rule is what the data is tested against. If the data fails to meet the criteria an error message will appear.<br />Validation<br />
  4. 4. Presence check – has the data been entered<br />Range check – is the data within a certain range of letters or numbers? E.g. 1-99<br />Format check – does the data follow a correct pattern e.g. DOB 18/02/1981<br />Length check – Has the correct number of characters been entered?<br />List/Lookup check – Is the data within the list of acceptable values?<br />Cross Field check – Checks two fields are entered correctly e.g. if a particular phone is available on only one network it will be rejected if a different network is selected<br />Check digit – Make sure longer numbers are entered correctly e.g. barcode (last digit checks via complex calculation that the previous digits are correct)<br />Validation Types<br />
  5. 5. Validation reduces data entry errors but can not remove them completely<br />Example:<br />18/02/1991 might be entered instead of 18/02/1981<br />The above meets the validation rule (format) but is obviously wrong which might mean that the system rejects the customers application (e.g. would be to young to get a phone contract)<br />To avoid this we use verification<br />Validation Continued<br />
  6. 6. Is the process of proofing the data <br />This can be done by proofreading or double data entry (two pass verification)<br />Double data entry is where the data is entered twice systematically and then verified to make sure both entries are the same<br />Verification<br />

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