Comprehensive Summary of the Grade 11
Computer Applications Technology (CAT)
Theory Book
Term 1
Chapter 1: General Concepts of Computing
This chapter introduces fundamental computing concepts, including
the information processing cycle (input, processing, storage, output,
and communication), the classification of computers, the role of ICTs in
the workplace, and the value of CAT as a subject.



Unit 1.1: Information Processing Cycle
o Input: Data entry through devices like keyboards, scanners,
and touchscreens.
o Processing: The CPU processes input data using instructions.
o Storage: Data is saved in primary storage (RAM) or
secondary storage (HDD, SSD, USB drives).
o Output: Displays processed data via monitors, printers, or
speakers.
o Communication: Data transmission over networks or the
internet.
Unit 1.2: Computer Features and Classification
o Computers are categorized based on processing power and
portability:
 Non-portable: Servers, desktops.
 Portable: Laptops, tablets, smartphones.
 Dedicated devices: ATMs, smart fridges.
Unit 1.3: Role of ICTs in the Workplace
o Impact of ICTs: Faster communication, automation, virtual
offices, and improved business efficiency.
o BYOD (Bring Your Own Device): Employees use personal
devices for work.
1

Unit 1.4: Value of CAT
o Computer literacy is essential for employment.
o CAT improves efficiency, adaptability, and technical skills in
various careers.
C
hapter 2: Input, Output, and Other Devices
T
his chapter explores various input and output devices, their
functions, advantages, and disadvantages.



Unit 2.1: Input Devices
o Scanners, digital cameras, biometric devices (fingerprint,
facial recognition), ATMs, POS systems, wireless devices,
touchscreens.
o Factors affecting image quality: Resolution, color depth, and
dynamic range.
Unit 2.2: Output Devices
o Display devices: Monitors, projectors, interactive
whiteboards.
o Quality factors: Resolution, aspect ratio, contrast ratio,
response time.
o Printers: Laser vs. inkjet, dpi, ppm, duty cycle.
Unit 2.3: Devices, Software, and Equipment
o Device drivers: Software that enables communication
between hardware and the OS.
o Plug-and-play: Automatic recognition and installation of
new devices.
o OCR (Optical Character Recognition): Converts printed text
into digital form.
2
Term 2
Chapter 3: Storage, Memory, and Processing Devices
Covers different storage types, processing components, and
troubleshooting methods.



Unit 3.1: Storage Devices
o Primary storage: RAM, ROM.
o Secondary storage: HDD, SSD, USB drives.
o Backup storage: Cloud storage, external drives.
Unit 3.2: Processing Devices
o Motherboard: Main circuit board connecting components.
o CPU: Executes instructions; performance depends on clock
speed, cores, and cache.
o RAM vs. ROM: RAM is temporary storage, ROM is permanent.
Unit 3.3: Basic Troubleshooting
o Identifying and resolving common storage and processing
issues.
Chapter 4: Software
Covers application software, communication tools, compatibility issues,
and cloud computing.





Unit 4.1: Application Software
o Categories: Productivity (MS Office), multimedia,
collaboration tools.
Unit 4.2: Collaboration and Communication Software
o Multimedia software (video editing), communication
software (email, VoIP).
Unit 4.3: Compatibility Issues
o Importance of updating software for security and
performance.
Unit 4.4: Software for Physically Challenged Users
o Screen readers, speech recognition software.
Unit 4.5: Cloud-Based Applications
o Google Workspace (G Suite), Microsoft Office 365.
3

Unit 4.6: Online Storage
o Dropbox, Google Drive, OneDrive.
4
Term 3
Chapter 5: Hardware, Software, and Computer Management
Discusses system requirements, software installation, and file
management.



Unit 5.1: System Requirements
o RAM, CPU speed, storage, OS.
Unit 5.2: Software Installation
o Downloading and installing programs from online sources
and portable storage.
Unit 5.3: File Management
o File types, attributes, importing/exporting, searching for files.
Chapter 6: Social Implications of Hardware
Focuses on health, accessibility, and hardware protection.




Unit 6.1: Devices for Physically Challenged Users
o Alternative input/output devices.
Unit 6.2: Health Issues
o Ergonomics: Proper posture, screen positioning.
Unit 6.3: Protecting Hardware
o Surge protectors, antivirus software, security measures.
Unit 6.4: Power Supply and Settings
o UPS, power-saving settings.
Chapter 7: Networks and Internet Technologies
Covers network types, security, and internet access.


Unit 7.1: Networks
o LAN, WAN, Wi-Fi vs. Ethernet.
Unit 7.2: Intranet vs. Internet
o Differences between internal (intranet) and global (internet)
networks.
5

Unit 7.3: Basic Network Security
o Passwords, access rights, usernames.
Chapter 8: Social Implications of Computer Networks
Covers network security, privacy, and data management.




Unit 8.1: Social Issues in Networks
o Unauthorized access, ethical use, school policies.
Unit 8.2: Network Security
o Firewalls, encryption, privacy issues.
Unit 8.3: Databases and Big Data
o Storing, analyzing large datasets.
Unit 8.4: Cryptocurrency
o Bitcoin, blockchain technology.
6
Term 4
Chapter 9: Errors and Bugs
Discusses human error, data validation, and software bugs.



Unit 9.1: Human Error
o GIGO (Garbage In, Garbage Out) principle.
Unit 9.2: Data Verification & Validation
o Ensuring accuracy in databases.
Unit 9.3: Software Bugs
o Debugging, software patches.
Chapter 10: Social Issues and Online Protection
Covers cybersecurity, social engineering, and malware.





Unit 10.1: Social Engineering Tricks
o Phishing, scams.
Unit 10.2: Data Protection
o Backups, encryption.
Unit 10.3: Online Safety
o Cyberbullying, harassment.
Unit 10.4: E-Commerce & E-Banking
o Online shopping, security.
Unit 10.5: Antivirus Programs
o How antivirus software works.
Chapter 11: Internet & the World Wide Web
Covers communication technologies, online transactions, IoT, and
social media.


Unit 11.1: Internet Communication
o VoIP, video conferencing.
Unit 11.2: Online Transactions
o Security in e-commerce.
7

Unit 11.3: Internet of Things (IoT)
o Smart homes, devices.
o Unit 11.4: 4IR (Fourth Industrial Revolution)
o AI, automation.
Chapter 12 & 13: E-Communications & Information Management

Email management, data processing, spreadsheets, databases.
Conclusion
This textbook provides a detailed foundation in computing, covering
hardware, software, networks, security, and ICT’s impact on society and
the workplace.
8