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WJEC ICT GCSE

Data Validation and Verification. WJEC ICT GCSE. Task 1: Definitions. Write a definition for each of these terms:. Data Validation. A check performed by a computer program during data entry. Data Verification.

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WJEC ICT GCSE

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  1. Data Validation and Verification WJEC ICT GCSE

  2. Task 1: Definitions Write a definition for each of these terms: Data Validation A check performed by a computer program during data entry. Data Verification Means checking the data being entered into the system perfectly matches the source of the data.

  3. Task 2: Validation or Verification?

  4. Task 3: Fill in the missing words • Validation checks are used to restrict the data a user can enter. • verification means checking that the data being entered perfectly matches the source of the data. • Validation aims to ensure that data is complete, responsible and sensible. • A type check could be used to make sure that only numerical data could be entered. • A format check could be used to ensure the correct entry of a postcode. • A presence check could be used to ensure that a field is not left blank.

  5. Task 4: Data Validation • What is meant by check digit? • Give 2 different examples where check digits are used. An extra number added to the end of a long number which is calculated from all the other numbers and is used to ensure that the number has been input correctly. ISBN BARCODES

  6. Task 5: Data Validation • Here are some dates of birth that are to be entered into an ICT system: • 12/01/3010 • 01/13/2000 • 30/02/1999 • Assume all dates are in the format dd/mm/yyyy. For each one explain why they cannot be valid dates of birth. The year 2010 is in the future. There’s only 12 months. The isn’t 30th days in February.

  7. Task 6: Data Validation • Employees are given a employee code e.g. LLLNNNNNN (L is a letter, N is a number). Explain one type of validation that could be used with this field. • Employees are given an annual salary. Explain one type of validation that could be used with this field. -Format check -Length check -range check -data type check

  8. Task 7: What methods are being used?

  9. Extension Task • Using the internet, find out how a parity check actually works.

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