Philosophy · Class 12

Active learning ideas

Gettier Problem: Justified True Belief Reconsidered

Active learning helps students grasp the Gettier Problem because abstract concepts like justification and luck become tangible when they construct and analyse cases themselves. When students build scenarios step-by-step, their intuition about knowledge sharpens, making the critique of JTB more meaningful.

• CBSE Learning Outcomes
• CBSE Class 12 Philosophy, Part A, Unit 2: Nyaya Epistemology, The Four Pramanas (Sources of Valid Knowledge).
• NCERT Class 12 Philosophy Textbook: Detailed analysis of Pratyaksha (Perception) as a Pramana, including its types.
• CBSE Class 12 Philosophy, Part A, Unit 2: Understanding the role of perception in acquiring valid knowledge according to the Nyaya school.

• 20–40 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Problem-Based Learning
• 35 min · Small Groups

Gettier Case Construction

Small groups create original Gettier-style cases from daily life. They present and class critiques if JTB fails. Builds analytical depth.

Explain the core challenge posed by Gettier cases to the JTB account of knowledge.

Facilitation Tip

During Gettier Case Construction, give students a clear template with columns for belief, justification, truth, and luck so they focus on the structure rather than narrative details.

What to look for

Present students with a modified Gettier case: 'Suppose Ram believes his train will be late because the clock in the station is always 10 minutes fast, and he sees it read 9:50 AM, while his train is actually due at 10:00 AM and will be late. The clock is indeed 10 minutes fast, but by coincidence, his train is also running 10 minutes late. Does Ram *know* his train is late?' Facilitate a class discussion on why or why not, focusing on the role of luck and justification.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 02

• Problem-Based Learning
• 40 min · Pairs

JTB Defence Debate

Pairs defend JTB against Gettier or propose fixes like reliability. Rebut in class. Sharpens argumentative skills.

Analyze specific Gettier examples to understand their structure.

Facilitation Tip

In JTB Defence Debate, assign specific JTB refinements to pairs so each group brings a focused perspective to the discussion.

What to look for

Ask students to write down the three conditions of the JTB account of knowledge. Then, have them briefly explain in one sentence why Gettier cases challenge this definition. Collect these to gauge immediate comprehension of the core issue.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 03

• Problem-Based Learning
• 20 min · Individual

Luck vs Knowledge Reflection

Individuals journal a personal 'lucky true belief' and analyse via JTB. Share selectively. Fosters introspection.

Hypothesize potential solutions or modifications to the definition of knowledge.

Facilitation Tip

While facilitating Luck vs Knowledge Reflection, ask students to mark up their own cases with two colours: one for justification, another for luck, to visually separate the elements.

What to look for

Students work in pairs to create their own Gettier-style scenario. One student writes the scenario and identifies the justified true belief. The partner then critiques it, identifying any potential 'luck' or 'false lemma' elements. They then swap roles for a new scenario.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Teach this topic by moving from concrete examples to abstract theory, not the other way around. Start with simple Gettier cases, then gradually introduce technical terms like ‘false lemma’ only after students have felt the tension in their own examples. Avoid rushing to solutions; let the discomfort of counterexamples motivate refinement.

By the end of these activities, students should confidently articulate why Gettier cases challenge JTB and evaluate proposed defences. They should also craft their own examples and justify whether knowledge is present, showing deep engagement with epistemic concepts.

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Watch Out for These Misconceptions

• During JTB Defence Debate, watch for students claiming Gettier problems prove JTB is entirely wrong and useless.

  During JTB Defence Debate, redirect them to compare proposed fourth conditions like ‘no false lemmas’ or ‘safety’ and ask which scenario they salvage, showing JTB’s continued relevance.

• During Luck vs Knowledge Reflection, students may assume all justified true beliefs involve luck.

  During Luck vs Knowledge Reflection, have them sort their cases into two columns: ‘lucky’ and ‘non-lucky’ to clarify that most justified true beliefs do not rely on luck.

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Methods used in this brief

• Problem-Based Learning