🔹 Unit 1: Basic Concepts of ICT

GCE Advanced Level (Sri Lanka) • Complete Study Guide

1️⃣ Building Blocks: Data vs Information

📊 DATA (Raw Facts)

Unprocessed, unorganized facts
No context or meaning alone
Examples: 25, "Kandy", 1500

💡 INFORMATION (Processed Data)

Data + Context + Meaning
Useful for decision-making
Example: "Student aged 25 from Kandy scored 1500 marks"

🎯 Real-Life Example:
Supermarket Scenario

Data: "10", "Rice", "500", "2024-04-07"
Information: "10 bags of Rice sold at Rs. 500 each on April 7, 2024 → Total Revenue: Rs. 5,000"

2️⃣ Data Processing Life Cycle (DPLC)

1 Collection: Gathering raw data (e.g., survey forms, sensors, receipts)
2 Input: Entering data into system (keyboard, scanner, API)
3 Processing: Calculating, sorting, analyzing (CPU operations)
4 Storage: Saving data/information (HDD, cloud, database)
5 Output: Presenting results (reports, screens, prints)
6 Distribution: Sharing information with users

✅ Validation Techniques (Critical for Accuracy!)

Technique	Purpose	Example
Range Check	Ensures value within limits	Age: 18-65
Format Check	Verifies data pattern	Email: user@domain.com
Presence Check	Confirms field not empty	NIC number required
Check Digit	Detects transcription errors	ISBN, Credit Card numbers

3️⃣ Abstract Model of Information

This model explains how information flows through conceptual layers:

🔄 Information Flow Diagram:

[Source] → [Encoding] → [Channel] → [Decoding] → [Receiver]
     ↑                                      ↓
     └────── [Feedback Loop] ──────────────┘

📌 Practical Example: Online Order System

Source: Customer places order via mobile app
Encoding: App converts order to JSON data packet
Channel: Internet/4G network transmits data
Decoding: Server parses JSON, updates database
Receiver: Warehouse system receives order details
Feedback: SMS confirmation sent to customer

4️⃣ Six Components of an ICT System

💻 Hardware

Physical devices: CPU, monitor, keyboard, servers, routers

Example: POS machine in a shop

⚙️ Software

Programs & instructions: OS, apps, drivers, firmware

Example: Inventory management software

🗃️ Data

Facts & figures processed by the system

Example: Customer records, product prices

👥 People

Users, developers, administrators, technicians

Example: Shop owner using the CRM system

📋 Procedures

Rules, guidelines, workflows for system use

Example: "Backup database every Friday at 5 PM"

🌐 Networks

Communication pathways: LAN, WAN, internet, protocols

Example: Wi-Fi connecting shop devices to cloud

💡 Key Insight: All 6 components must work together! A powerful computer (hardware) is useless without software, data, trained people, clear procedures, and network connectivity.

5️⃣ Quality of Information (8 Key Characteristics)

Characteristic	Definition	Poor Quality Example
Accuracy	Error-free, correct data	Price shown as Rs. 50 instead of Rs. 500
Timeliness	Available when needed	Exam results published after university admissions close
Relevance	Applicable to user's need	Showing winter coat ads to a customer in Colombo in April
Completeness	All necessary details included	Order confirmation without delivery address
Consistency	Uniform across systems	Customer name spelled differently in billing vs. shipping
Accessibility	Easy to obtain by authorized users	Important notice only posted on physical board, not online
Verifiability	Can be confirmed as true	"50% off!" with no terms, conditions, or end date
Security	Protected from unauthorized access	Student grades visible to all users in a shared drive

6️⃣ Evolution & History of Computing

🕰️ Generations of Computers

Generation	Period	Technology	Example
1st	1940-1956	Vacuum Tubes	ENIAC, UNIVAC
2nd	1956-1963	Transistors	IBM 1401
3rd	1964-1971	Integrated Circuits (IC)	IBM System/360
4th	1971-Present	Microprocessors	Personal Computers, Smartphones
5th (Emerging)	Present-Future	AI, Quantum Computing	IBM Quantum, Neural Networks

🇱🇰 Sri Lankan Context

1980s: First computer at University of Colombo
1990s: Introduction of ICT in education policy
2000s: Expansion of internet, mobile penetration
2020s: Digital Sri Lanka initiative, e-Government services

7️⃣ Societal Impact & Ethics

✅ Positive Impacts

Education: e-Thaksalawa, online learning platforms
Healthcare: e-Channeling, telemedicine in rural areas
Commerce: Digital payments (FriMi, Genie), e-commerce growth
Governance: e-Sri Lanka, online license applications

⚠️ Challenges & Ethics

Digital Divide: Urban vs. rural internet access gap
Privacy: Data collection without consent (PDPA compliance needed)
Cybercrime: Phishing, online fraud targeting Sri Lankans
Job Displacement: Automation affecting traditional roles

🛡️ Ethical Principles for ICT Professionals

Confidentiality: Protect user data (e.g., don't share customer phone numbers)
Integrity: Ensure data accuracy; don't manipulate records
Availability: Maintain systems for legitimate users
Accountability: Take responsibility for system outcomes
Respect for IP: Use licensed software; cite sources

Reference: Sri Lanka Computer Emergency Readiness Team (CERT|CC) Guidelines

❓ Practice Questions & Answers

Q1: Differentiate between data and information with a school-related example. [4 marks]

Answer:
• Data: Raw, unprocessed facts without context. Example: "85", "Maths", "Term1"
• Information: Processed data with meaning for decision-making. Example: "Student scored 85 marks in Maths Term 1 exam, which is above class average of 72"
• Information helps teachers identify student performance trends; data alone cannot.
[2 marks for definition + 2 marks for relevant example]

Q2: Explain THREE validation techniques used during data input. [6 marks]

Answer:
1. Range Check: Ensures numeric input falls within acceptable limits. Example: Age field accepts 16-60 for A/L applicants.
2. Format Check: Verifies data matches required pattern. Example: NIC number must be 12 digits or 10 digits + letter.
3. Presence Check: Confirms mandatory fields are not left blank. Example: "Index Number" cannot be empty in exam registration.
[2 marks each: 1 for technique name + 1 for explanation/example]

Q3: Why is 'timeliness' critical for information quality in emergency services? [3 marks]

Answer:
• In emergencies (e.g., ambulance dispatch), delayed information can cost lives.
• Real-time location data of nearest ambulance enables faster response.
• Outdated traffic information may lead to inefficient routing.
[1 mark per valid point]

Q4: List the SIX components of an ICT system and give ONE Sri Lankan example for 'Procedures'. [7 marks]

Answer:
Components (1 mark each, max 6): Hardware, Software, Data, People, Procedures, Networks
Procedure Example: "All government e-services must use two-factor authentication as per ICTA security policy" OR "School computer labs require login with student index number before internet access"
[1 mark for relevant local procedure example]

Q5: How has ICT reduced the 'digital divide' in rural Sri Lanka? Provide TWO specific initiatives. [4 marks]

Answer:
1. Nenasa TV/Online Classes: Free educational content via TV and YouTube during pandemic, reaching students without smartphones.
2. Community Information Centers (CICs): Government-established centers in divisional secretariats providing free internet/computer access for rural citizens.
[2 marks per initiative: 1 for naming + 1 for explanation of impact]

🎯 Exam Tips for Unit 1

Always use Sri Lankan context in examples for higher marks
For "explain" questions: Definition + Example + Significance
Memorize the 8 quality characteristics using acronym: ART CC AVS (Accuracy, Relevance, Timeliness, Completeness, Consistency, Accessibility, Verifiability, Security)
Practice drawing the DPLC flowchart with validation checkpoints

1.1 Data and Information

In-depth Analysis of Data

Data is the foundation of Information and Communication Technology (ICT). Data refers to a collection of raw facts, words, symbols, or numbers that have not been processed and do not carry a specific meaning or purpose. The primary nature of data is that it acts as raw material used to produce information. When data is used alone, it does not provide meaningful conclusions for decision-making.

Examples of Data:

Measurements or images
Words and sounds
Marks, height, weight, age (quantitative data)

In-depth Analysis of Information

Information is the result obtained after processing data. It is meaningful, organized, and can be used for decision-making. Information is always processed, contextualized, and directly useful for making decisions.

Characteristics of Quality Information:

Accuracy: Must be correct for reliable decisions
Timeliness: Must be up-to-date
Completeness: Should contain all necessary details
Relevance: Must be appropriate for the task
Understandability: Should be easy to understand

Table 1: Comparison between Data and Information

Feature	Data	Information
Definition	Unprocessed raw facts without meaning	Processed, meaningful data used for decision-making
Nature	Raw material	Output
Usefulness	Not directly useful for decisions	Helps in decision-making

1.2 Data Processing Life Cycle and Drawbacks of Manual Data Handling

Data Life Cycle

The Data Life Cycle refers to the process of creating data, managing it to generate information, and removing data that is no longer needed.

Main Stages of Data Life Cycle:

Data Creation: Inputting required data into the system
Data Management: Secure storage and maintenance of data
Removal of Obsolete Data: Deleting outdated data

The main steps of the Data Processing Life Cycle (DPLC) are: Data collection, validation, processing, output, and storage.

Major Drawbacks of Manual Data Handling:

High risk of human errors: Mistakes and delays
Inefficiency: Time-consuming processes
Inconsistency: Data duplication and lack of standardization

1.3 Classification of Software: Open Source vs Proprietary

System Software and Application Software

System Software: Acts as a bridge between hardware and user (e.g., Operating Systems)
Application Software: Designed to perform specific tasks (e.g., MS Word)

Open Source Software (OSS) vs Proprietary Software

Open Source Software (OSS) provides access to its source code, allowing users to modify it. In contrast, proprietary software keeps the source code hidden and requires a license for use.

1.4 Use and Impact of Information and Communication Technology (ICT)

Areas of ICT Applications:

Education: E-learning, distance learning
Healthcare: Telemedicine, diagnostic systems
Business: E-commerce, online banking

Social and Environmental Issues in ICT:

Digital Divide: Inequality in access to technology
E-waste: Environmental pollution from electronic waste
Green Computing: Environmentally friendly use of ICT resources

Data Life Cycle (Extended)

Main 7 Steps of Data Life Cycle:

Data Generation: Creation or input of new data
Data Collection: Gathering data from various sources
Data Storage: Saving data securely (hard drives/cloud)
Data Processing: Converting raw data into information
Data Transmission: Sending data between locations
Data Usage: Using data for decisions or operations
Data Destruction: Permanently deleting unnecessary data

Advantages:

Data Security: Prevents misuse of data
Efficiency: Faster decision-making through proper management
Legal Compliance: Meets data retention regulations

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Tuesday, April 7, 2026

GCE A/L ICT Lesson 1: Basic Concepts of ICT | 1. Data and Information: The Building Blocks · 2. The Data Processing Life Cycle · 3. Characteristics of Quality Information · 4. Components of an ICT System ·