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Unit 1: Organisation and structure of data

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How is the security and integrity of data protected through backups, archiving and integrity processes?

Data security and integrity processes, including backups, archiving, and methods of keeping data accurate and consistent.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on data security and integrity, covering the difference between backups and archiving, full and incremental backups, why data integrity matters, and the processes (such as validation, verification and access control) used to keep data accurate, consistent and safe.
8 min answer →

What are the common data types and data structures, and how are validation and verification used to keep data correct?

The common data types, the use of data structures such as arrays and records, and the difference between validation and verification.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on data organisation, covering the common data types (integer, real, Boolean, character and string), data structures such as arrays and records, and the difference between validation and verification with examples of each technique.
8 min answer →

How are databases organised, and what is the difference between a flat file and a relational database?

The purpose of a database, the terms table, record, field and key, the difference between flat-file and relational databases, and the idea of a distributed system.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on databases, covering what a database is, the terms table, record, field and primary key, the difference between a flat-file and a relational database and why relational reduces data duplication, and the idea of a distributed system.
9 min answer →