Validation (CIE IGCSE ICT)

Why use validation?

• Validation is essential to ensure data is accurate, complete, and meets specific criteria before it's processed
• It helps minimise data entry errors and maintains the integrity of the data

Characteristics and Uses of Validation Checks

• Range check: Confirms that the data entered falls within a specific range
• Character check: Ensures that the data contains the correct type of characters, like letters or numbers
• Length check: Verifies the data entered is of the correct length
• Type check: Validates that the data is of the correct type, like text or number
• Format check: Confirms the data is in the correct format, such as a valid email address or date
• Presence check: Ensures that the data field is not left empty

Using Validation Routines

• Validation routines are procedures that automatically perform validation checks
• They help to minimise data entry errors, saving time and maintaining data quality