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Overview
Data use is all about how information is handled in IT systems to make it accurate, reliable, and useful.
Different types of data, such as numbers, dates, text, or true/false values, are used in different situations. For example, numeric data might be used for prices, while text is used for names. To keep data accurate,
IT systems use validation to check if the data entered is sensible and in the right format, such as making sure a phone number has the correct number of digits.
Verification is about checking that the data matches the original source, for example by double-checking entries. Validation tools include checks for data type, format, length, and range.
Verification tools include double entry and manual checking. Understanding data types, validation, and verification helps ensure that information in IT systems is correct and trustworthy, which is essential for decision-making, problem-solving, and day-to-day operations.
You will use data and information while working on your coursework.
What You Need to Learn
What You Need to Learn
Data Use
Data Use
📊 3.2.1 Use of Data Types in Different Contexts
📊 3.2.1 Use of Data Types in Different Contexts
Alphanumeric – letters and numbers (e.g. password: “abc123”).
lean – true/false or yes/no values.Date – stored in a set format (e.g. DD/MM/YYYY).
Numeric –
Currency – money values (£, $, €).
Decimal – numbers with decimal places.
Integer – whole numbers.
Percentages – parts of 100 (%).
Real –any number, real or decimal
Text – letters, words, sentences.
🔍 3.2.2 The Difference Between Validation and Verification
🔍 3.2.2 The Difference Between Validation and Verification
Validation – checks data is sensible and in the right format.
Verification – checks data matches the original source.
✅ 3.2.3 Data Validation Tools
✅ 3.2.3 Data Validation Tools
Data type check – checks the data is the right type.
Format check – checks data follows a set pattern.
Input mask – sets a template for how data is entered.
Length check – ensures data has the right number of characters.
Lookup – matches data to a pre-set list.
Presence check – ensures data is entered.
Range check – ensures data is within a set range.
Limited choice – offers set options (e.g. dropdown list).
📝 3.2.4 Data Verification Tools
📝 3.2.4 Data Verification Tools
Double entry – enter the same data twice and compare.
Manual checking – visually check data against the original.
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