Learn: Validation and Verification

Welcome!Today we'll learn about validation and verification, key concepts to ensure data accuracy and reliability in computer systems. Let's break it down step by step and explore how these processes work!

What is Validation?Validation is the process of checking that data is sensible, reasonable, and allowed before it is accepted into a system. It helps to reduce errors by ensuring the data follows specific rules.

Validation MethodsDifferent validation methods are used to check the accuracy of data:Range check: Ensures data is within a set range (e.g., age between 0 and 120).Type check: Ensures data is of the correct type (e.g., numbers only).Length check: Ensures the data meets the required number of characters (e.g., a postcode).Presence check: Ensures that required data is entered (e.g., name cannot be blank).

What is Verification?Verification is the process of ensuring that data has been entered correctly and matches the source. It confirms accuracy after validation.

Verification MethodsCommon verification methods include:Double entry: Data is entered twice, and both entries are compared to ensure they match.Proofreading: Checking data visually against the original source.

Why is Validation and Verification Important?Validation and verification help prevent errors in computer systems by ensuring data is accurate and reliable. Incorrect data can cause problems such as incorrect results, system crashes, or poor decision-making.

Review Time!Great work! You've learned about validation and verification. Let's test your understanding with a few questions to wrap up.