Class: Junior Secondary School 3 (JSS 3 / JS3)
Term: 3rd Term
Week: 2
Age: 14 years
Duration: 45 minutes
Subject: Basic Science and Technology
Curriculum Theme: Computer Studies / Information Technology
Previous Lesson: Computer Virus: Meaning and Types of Computer Virus.
Topic: SOURCE OF VIRUSES
Subject Matter: Infected diskettes, Infected CD-ROMS, E-mail: Internet download Illegal duplication of software.

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define a computer virus.
Identify common sources of computer viruses.

Affective Domain:

Appreciate the importance of protecting computers from viruses.
Develop a cautious attitude towards opening unknown files or using unfamiliar storage devices.

Psychomotor Domain:

List ways to prevent virus infection.
Identify potential signs of a computer virus infection.

Share knowledge about computer virus prevention with peers.
Promote safe computing practices within their community.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
State Unified Scheme of Work
Basic Science and Technology for Junior Secondary Schools 3

Instructional Materials

The teacher will teach this lesson with the aid of:

Charts showing sources of viruses
Posters illustrating virus effects
Video clips on computer virus spread (if available)
A computer and projector (for video clips)
Sample diskettes and CD-ROMs

Rationale for the Lesson

This lesson helps pupils understand how computer viruses spread. Knowing these sources is important for protecting personal computers and data from damage, ensuring safe and efficient use of technology in daily life.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of computers, their components, and how to use storage devices like diskettes and CDs.

Lesson Content/Board Summary

SOURCE OF COMPUTER VIRUSES

What is a Computer Virus?

A computer virus is a malicious software program that can attach itself to other programs and spread from one computer to another, often without the user’s knowledge. It can cause various problems, from slowing down the computer to deleting files or corrupting data.

Common Sources of Computer Viruses:

Computer viruses can spread through various means. Understanding these sources helps in preventing infection.

Infected Diskettes: Using diskettes that have been previously used on an infected computer can transfer viruses when inserted into a healthy computer.
Infected CD-ROMs/DVDs: Similar to diskettes, CD-ROMs or DVDs containing pirated software, games, or other files obtained from untrusted sources can carry viruses.
Email Attachments: Opening attachments from unknown or suspicious email addresses is a common way for viruses to enter a computer. These attachments often contain malicious code.
Internet Downloads: Downloading files, software, music, or videos from untrusted websites, file-sharing networks, or pop-up ads can expose a computer to viruses.
Illegal Duplication of Software (Pirated Software): Installing pirated software, which is often tampered with, is a high-risk activity as it frequently comes bundled with viruses or malware.
USB Flash Drives/External Hard Drives: Connecting external storage devices that have been used on infected computers can easily transfer viruses to a new system.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reviews the previous lesson on types of computer software. The teacher then introduces the new topic: “Sources of Computer Viruses.”
Pupils’ Activity: Pupils respond to greetings, recall the previous lesson, and listen attentively to the new topic.
Learning Point: Pupils are prepared for the lesson and connect it to prior knowledge.

Step 2: Explanation of Computer Viruses

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines what a computer virus is in simple terms and explains its harmful effects using examples.
Pupils’ Activity: Pupils listen to the explanation and ask questions for clarification.
Learning Point: Pupils understand the basic concept of a computer virus.

Step 3: Discussion of Infected Diskettes/CD-ROMs

Time: 8 minutes
Teaching Skill: Discussion/Demonstration
Teacher’s Activity: The teacher explains how viruses can be spread through infected diskettes, CD-ROMs, and DVDs, emphasizing the danger of using media from unknown sources. The teacher displays sample diskettes and CD-ROMs.
Pupils’ Activity: Pupils observe the samples and discuss their experiences or knowledge about using such media.
Learning Point: Pupils identify physical storage media as sources of viruses.

Step 4: Email and Internet Downloads as Sources

Time: 8 minutes
Teaching Skill: Explanation/Questioning
Teacher’s Activity: The teacher explains how email attachments, untrusted internet downloads, and malicious websites can introduce viruses to a computer.
Pupils’ Activity: Pupils share examples of suspicious emails or downloads they may have encountered.
Learning Point: Pupils understand digital transmission methods of viruses.

Step 5: Illegal Software Duplication

Time: 7 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher discusses the risks associated with installing illegally duplicated (pirated) software, explaining that these often contain hidden viruses.
Pupils’ Activity: Pupils listen and understand the dangers of using unlicensed software.
Learning Point: Pupils recognize illegal software as a virus source.

Step 6: Demonstration/Visuals

Time: 5 minutes
Teaching Skill: Visual Aids/Demonstration
Teacher’s Activity: The teacher uses charts, posters, or a short video clip (if available) to visually illustrate the sources of computer viruses and their effects.
Pupils’ Activity: Pupils observe the visual aids and ask questions.
Learning Point: Visual reinforcement helps pupils grasp the concepts better.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define a computer virus.
List three common ways a computer can get infected with a virus.
Explain why it is dangerous to open email attachments from unknown senders.
What is the risk of installing pirated software?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the key learning points on sources of computer viruses and gives an assignment: “Research and write down three ways to protect a computer from viruses.”
Pupils’ Activity: Pupils listen to the summary and copy the assignment.
Learning Point: The lesson is concluded, and pupils are given further tasks.

Lesson Keywords

Computer virus – A malicious program that infects computers.
Infected – Containing a harmful virus.
Diskette – An old type of portable storage device.
CD-ROM – A compact disc used to store data.
Email attachment – A file sent along with an email message.
Internet download – Obtaining files from the internet.
Software duplication – Copying computer programs.

Differentiation

For slower learners, the teacher will focus on identifying at least three main sources of viruses through simplified explanations and direct questioning. For faster learners, the teacher will encourage them to discuss the potential impact of a virus attack and suggest advanced protective measures.

Note for teachers using this lesson plan

Teachers should ensure that visual aids are clear and relevant. Practical demonstrations, if possible, such as showing how to scan a USB drive before opening it, can enhance understanding. Encourage pupils to share their experiences with computer viruses to make the lesson more relatable.