Why logic belongs in P4C

Matthew Lipman's early P4C novel, Harry Stottlemeier's Discovery, centres on a child noticing that some sentences cannot simply be turned around. That idea still works well in classrooms today. Children enjoy finding the rule that seems right but fails.

In a community of enquiry, logic is practised rather than lectured. Children learn to say 'That doesn't follow', 'What if...?' and 'You're assuming that...' because they need those phrases to win a point fairly.

Stimulus and questions

Stimulus, 'The Red Hats': On Monday, every child in Class 4 who wore a red hat was late. On Tuesday, Leo wears a red hat. His friend Ada says, 'You're going to be late.' Leo says, 'That's silly. The hat doesn't make me late.' Ada replies, 'But it happened every single time.'

• Does something happening every time prove it will happen again?

• Can two things happen together without one causing the other?

• How many times would you need to see something before you believed it?

• If all late children wore red hats, are all red-hat wearers late?

• Is Ada being unreasonable, or just careful?

Sample session: ages 9 to 12, 50 minutes

Materials: the story on a slide or card, mini whiteboards, pens, three sorting cards labelled 'Always true', 'Sometimes true', 'Never true'.

• 5 min: warm-up. Read out statements such as 'All dogs are animals, so all animals are dogs'. Children hold up a whiteboard: true or false, with one word of reason.

• 5 min: read the stimulus and allow thinking time.

• 10 min: small groups write questions, then share and vote.

• 20 min: enquiry on the chosen question.

• 5 min: sorting. Groups place three claims from the discussion on the sorting cards.

• 5 min: reflection. 'One reason I heard today that made me think harder was...'

Facilitator moves and adaptation

Listen for hidden assumptions and name them gently: 'Are we assuming the hat and the lateness are connected?'. Ask for tests: 'How could Leo find out?'. Invite counter-examples and write strong ones on the board so the group can return to them.

For 7 and 8 year olds, use concrete objects: a bag of shapes where all the red ones are circles but not all circles are red. Older children can try writing their own 'trick' rule for classmates to break. Keep ground rules in view, especially 'disagree with the idea, not the person', since logic sessions can feel competitive.

Key points

• Pick stimuli with a rule that seems right but can fail.

• Teach the phrases 'That doesn't follow' and 'What if...?' early.

• Record strong counter-examples where everyone can see them.

• Use physical sorting for younger children before abstract statements.

Ready-made resources

Printable session plans and materials for this topic are available from EduTrend Contents: P4C-130 Good Reasons: Thinking Clearly.

Photos: Judy Beth Morris, Michał Parzuchowski / Unsplash