Proofing Techniques (Cambridge International IGCSE ICT)

Verification

Spec point — 15.2.3

What is verification?

• Verification is a method of checking that data being copied from one medium to another does not contain errors

• Verification does not prevent all errors, it helps to reduce errors in the data entry process

• The two most common verification techniques are:

  • Visual verification
  • Double data entry verification

Visual verification

• Manual method of verifying data by comparing the source with the entered data

Double data entry verification

• A method where data is entered twice and then compared for inconsistencies

Is there a need for validation as well as verification?

• While verification ensures data is entered correctly, validation makes sure the data is sensible, reasonable and within acceptable boundaries
• Both verification and validation are essential in maintaining data accuracy and quality

Worked Example A local railway company is considering introducing a new system for its passengers using e-tickets on a smartphone. Details of each of the passengers have been entered into the database.

a. Give one reason why this data was verified on entry.

[1]

Proofreading is sometimes thought to be verification. b. Explain the difference between verification and proofreading.

[2]

Answers

**a. To ensure that the data entered has been copied correctly [1]

b. Proofreading is checking the content of the data for errors [1] Verification is comparing the data with the original [1]**