1. Data Representation

Number Systems

Computers & Binary

Number Systems

Converting Between Binary & Denary

Converting Between Hexadecimal & Denary

Converting Between Hexadecimal & Binary

Uses of Hexadecimal

Binary Addition

Binary Shifts

Two's Complement

Text, Sound & Images

Character Sets

Representing Sound

Representing Images

Data Storage & Compression

Units of Data Storage

Calculating File Sizes

Compression

2. Data Transmission

Types & Methods of Data Transmission

Data Packets

Packet Switching

Data Transmission

Universal Serial Bus (USB)

Methods of Error Detection

Error Checking

Error Detection Methods

Check Digits

Automatic Repeat Query (ARQ)

Encryption

Encryption

3. Hardware

Computer Architecture

The CPU & Microprocessors

Von Neumann Architecture

The Fetch-Decode-Execute Cycle

Characteristics of the CPU

CPU Instruction Sets

Embedded Systems

Input & Output Devices

Input Devices

Output Devices

Sensors

Data Storage

Primary Storage

Secondary Storage

Virtual Memory

Cloud Storage

Network Hardware

Network Interface Card (NIC)

MAC Addresses & IP Addresses

Router

4. Software

Types of Software & Interrupts

System Software & Application Software

The Purpose & Functionality of Operating Systems

Hardware, Firmware & the Operating System

Interrupts

Types of Programming Language, Translators & Integrated Development Environments (IDEs)

Levels of Programming Languages

Assembly Language

Translators, Compilers & Interpreters

Tools & Facilities in IDEs

5. The Internet & its Uses

The Internet & the World Wide Web

The Internet & the World Wide Web

Network Protocols

Web Browser

Web Pages

Cookies

Digital Currency

Digital Currency

Cyber Security

Cyber Security Threats

Keeping Data Safe

6. Automated & Emerging Technologies

Automated Systems

Automated Systems

Robotics

Robotics

Artificial Intelligence

Artificial Intelligence (AI)

7. Algorithm Design & Problem-Solving

Development Life Cycle

Program Development Life Cycle

Computer Sub-Systems

Computer Sub-Systems

Problem Decomposition

Algorithms

Designing Algorithms

Explaining Algorithms

Standard Methods of a Solution

Linear Search & Bubble Sort

Other Standard Methods of a Solution

Validation & Verification

Validation & Verification

Suitable Test Data

Trace Tables

Identifying Errors

Identifying Errors

Writing & Amending Algorithms

8. Programming

Programming Concepts

Variables & Constants

Data Types

Input & Output

Sequence

Selection

Iteration

Totalling & Counting

String Handling

Arithmetic, Logical & Boolean Operators

Procedures & Functions

Local & Global Variables

Library Routines

Maintaining Programs

Arrays

Arrays

File Handling

File Handling

9. Databases

Databases

Single Table Databases

Primary Keys

SQL

SQL

10. Boolean Logic

Boolean Logic

Logic Gates

Logic Circuits

Truth Tables

Logic Expressions

Study tools

• Cambridge (CIE) O Level Computer Science · Exam Questions
• Cambridge (CIE) O Level Computer Science · Flashcards
• Cambridge (CIE) O Level Computer Science · Past Papers

Related links

• O Level Computer Science · Revision Notes
• O Level Computer Science · Exam Questions
• O Level Computer Science · Flashcards
• O Level Computer Science · Past Papers
• Cambridge (CIE) O Level Computer Science · Exam specification