Class: Junior Secondary School 3 (JSS 3 / JS3)
Term: 3rd Term
Week: 1
Age: 14 years
Duration: 45 minutes
Subject: Basic Science and Technology
Curriculum Theme: Computer Studies / Information Technology
Previous Lesson: Third Term Computer Studies Examination.
Topic: COMPUTER VIRUS
Subject Matter: Meaning and types of computer virus: Boot sector, Executable file virus, Attack on document, Examples of computer virus: Trojan horse, sleeper, logic bomb, Alabama virus.

Specific Objectives

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

Cognitive Domain:

Define a computer virus.
Identify different types of computer viruses.
Explain examples of common computer viruses.

Affective Domain:

Appreciate the importance of protecting computers from viruses.
Recognize the potential damage computer viruses can cause.
Be aware of safe computing practices.

Psychomotor Domain:

Suggest simple ways to prevent computer virus infections.
Demonstrate basic knowledge of computer security measures.

Share knowledge about computer virus prevention with peers.
Advocate for responsible computer usage to avoid virus spread.

Reference Materials

The following resources were used in planning this lesson:

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

Instructional Materials

The teacher will teach this lesson with the aid of:

Charts showing different types of computer viruses.
Posters illustrating virus symptoms.
Video clips demonstrating how viruses spread.
A computer and projector.

Rationale for the Lesson

This lesson helps pupils understand what computer viruses are and how they can harm computer systems. Knowing about viruses enables pupils to take necessary precautions to protect their devices and data, promoting safer digital interactions in their daily lives.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of computer components and their functions.

Lesson Content/Board Summary

COMPUTER VIRUS

Meaning of Computer Virus

A computer virus is a malicious software program or code that attaches itself to another program and then reproduces itself, spreading from one computer to another. It is designed to interfere with computer operations, record, corrupt, or delete data, or otherwise compromise the computer system.

Types of Computer Viruses

Computer viruses can be categorized based on how they infect a system. The following are common types of computer viruses:

Boot Sector Virus: This type of virus infects the master boot record or the boot sector of a hard disk or floppy disk. It activates when the computer starts up.
Executable File Virus: These viruses attach themselves to executable files (files with extensions like .exe, .com, .bat, .sys). When the infected program is run, the virus also runs and infects other executable files.
Attack on Document (Macro Virus): Macro viruses infect files created with applications that support macros (e.g., Microsoft Word documents, Excel spreadsheets). They are embedded in the macros within these documents and spread when the document is opened.

Examples of Computer Viruses

Here are some examples of specific computer viruses or malware types:

Trojan Horse: A Trojan horse is a type of malware that disguises itself as legitimate software. Unlike viruses, Trojans do not reproduce by infecting other files but can cause significant damage, such as creating backdoors for attackers or stealing data.
Sleeper (Time Bomb/Logic Bomb): These are malicious programs designed to lie dormant in a system until a specific condition is met (e.g., a specific date, time, or event). Once the condition is met, the “bomb” detonates, executing its harmful payload.
Logic Bomb: Similar to a time bomb, a logic bomb is a piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met.
Alabama Virus: This is an older, well-known virus that was designed to infect executable files and was known for causing system crashes and data loss.

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 asks them if they have ever heard of a “computer virus” or if their computers have ever behaved strangely.
Pupils’ Activity: Pupils respond to the teacher’s questions and share their experiences.
Learning Point: Pupils are introduced to the topic and relate it to their experiences.

Step 2: Meaning of Computer Virus

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher explains the meaning of a computer virus using simple language and a chart, highlighting its malicious nature.
Pupils’ Activity: Pupils listen attentively and ask questions for clarification.
Learning Point: Pupils understand what a computer virus is.

Step 3: Types of Computer Viruses

Time: 10 minutes
Teaching Skill: Illustration/Classification
Teacher’s Activity: The teacher explains and illustrates the different types of computer viruses, such as boot sector, executable file, and macro viruses, using charts and examples.
Pupils’ Activity: Pupils observe the charts, take notes, and ask questions.
Learning Point: Pupils identify and differentiate between various types of computer viruses.

Step 4: Examples of Computer Viruses

Time: 10 minutes
Teaching Skill: Elaboration/Examples
Teacher’s Activity: The teacher discusses specific examples of computer viruses like Trojan horse, sleeper/logic bomb, and Alabama virus, explaining their characteristics and how they operate. Video clips may be used to enhance understanding.
Pupils’ Activity: Pupils watch the video clips, listen, and contribute to the discussion.
Learning Point: Pupils gain knowledge of common computer virus examples and their effects.

Step 5: Preventive Measures

Time: 7 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher guides pupils in a discussion on simple ways to prevent computer virus infections, such as using antivirus software, being cautious with unknown emails, and regularly backing up data.
Pupils’ Activity: Pupils suggest and discuss various preventive measures.
Learning Point: Pupils learn practical steps to protect their computers from viruses.

Step 6: Evaluation/Review

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

What is a computer virus?
Mention two types of computer viruses.
List three examples of computer viruses.
Suggest two ways to prevent computer virus infection.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 7: Conclusion

Time: 1 minute
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson and assigns homework, which includes researching more examples of computer viruses.
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: The lesson is reinforced and pupils are given further learning tasks.

Lesson Keywords

Virus – A malicious program that infects and spreads.
Malware – Software designed to cause damage to a computer.
Boot Sector – The part of a disk that contains startup information.
Executable File – A file that contains instructions for a computer to execute.
Trojan Horse – Malware disguised as legitimate software.
Logic Bomb – Malware that activates under specific conditions.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to research specific historical computer virus outbreaks. For pupils needing more support, the teacher will provide simplified definitions and more visual aids, focusing on the most common types and prevention methods.

Note for teachers using this lesson plan

Teachers should ensure the charts and video clips used are clear, age-appropriate, and directly illustrate the concepts of computer viruses. Encourage pupils to share their experiences with computer security to make the lesson more relatable and interactive. Emphasize the practical aspects of virus prevention.