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Unit 1: Software and system development

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What is the difference between low-level and high-level languages, and how do assemblers, compilers and interpreters translate programs?

Low-level and high-level programming languages, the need for translators, and the differences between assemblers, compilers and interpreters.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on programming languages and translators, covering low-level (machine code and assembly) and high-level languages, why translators are needed, and the differences between assemblers, compilers and interpreters with their advantages and disadvantages.
9 min answer →

What does an operating system do, and what are its main functions?

The purpose of the operating system and its main functions: managing memory, processes, peripherals and files, providing a user interface, and managing security.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on the operating system, covering its purpose and main functions: managing memory and processes, controlling peripherals and devices, managing files, providing the user interface, and handling security and user accounts.
8 min answer →

What is the difference between system software and application software?

The need for different types of software, and the difference between system software and application software with examples of each.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on types of software, covering the difference between system software and application software, the purpose of each category, examples such as operating systems and utilities versus word processors and browsers, and why both are needed.
8 min answer →

What is utility software, and what do common utility programs do?

The purpose of utility software and the function of common utilities, including antivirus, backup, file compression and disk defragmentation.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on utility software, covering what utility software is and the purpose of common utilities such as antivirus and other security tools, backup software, file compression and disk defragmentation, and why they help keep a computer running well.
8 min answer →