Thought Experiment
Thought experiments are mental simulations used to explore hypothetical scenarios, enabling the examination of ethical dilemmas, causal hypotheses, and complex systems without real-world consequences.
THE IDEA
What is a Thought Experiment?
A thought experiment explores the consequences of a hypothesis, theory, or principle in an imagined situation. It is useful when a real test would be impractical or unethical, or when we want to expose an assumption before designing a test. Its conclusions depend on the scenario and the reasoning used to develop it.
The Trolley Experiment
A runaway trolley is heading toward five people. You can divert it onto a track with one person. Should you do so? The source traces the modern problem to Philippa Foot’s “The Problem of Abortion and the Doctrine of the Double Effect,” and Judith Jarvis Thomson’s “The Trolley Problem,” which examines related moral distinctions. It also discusses a doctor killing a healthy patient to obtain organs for five others. Comparing these situations helps separate views about consequences, intentions, means, and foreseen side effects.
Historical Counterfactuals
Counterfactuals ask what might have happened if an event or decision had been different. They can expose assumptions about causation, but imagining a plausible alternative does not establish how history would actually have unfolded.
- Ask a question: What if Gavrilo Princip had not shot Archduke Franz Ferdinand?
- Research the context, including alliances, policies, personalities, and constraints.
- Refine the question: How did the assassination affect Austrian policy relative to other influences?
- Form hypotheses about the event’s role in the outbreak of war.
- Develop plausible alternatives, such as a failed assassination, and trace the reactions each would require.
- Evaluate those alternatives against historical evidence. Distinguish what is supported from what depends on conjecture; counting imagined scenarios does not measure their probability.
The value of these “what ifs” is in making assumptions visible and identifying evidence that could strengthen or weaken an explanation.
When to use it
Evaluating a business strategy by imagining the outcomes under different market conditions before committing resources.
Debating ethical dilemmas in team meetings to uncover hidden assumptions and values.
Preparing for a difficult conversation by mentally rehearsing various responses and their impacts.
Using a mental simulation to identify the implications of a scientific hypothesis and design an empirical test.
Evaluating ethical decisions in policy-making (e.g., autonomous vehicle crash logic).
Historical analysis to understand causal weight of specific events.
Training AI in moral reasoning through simulated dilemmas.
Improving strategic planning by simulating competitor responses.
FROM THEORY TO EVERYDAY LIFE
In practice
Einstein's Elevator
Albert Einstein imagined himself inside a falling elevator to explore the equivalence of gravitational and inertial mass, leading to insights in general relativity.
The Trolley Problem
A classic ethical thought experiment: a runaway trolley is heading toward five tied-up people; you can pull a lever to divert it onto a sidetrack where it will hit one person. This explores moral decision-making and the principle of double effect.
World War I Counterfactual
What if Gavrilo Princip had not assassinated Archduke Franz Ferdinand? Comparing plausible alternatives can reveal assumptions about how the assassination affected the outbreak of WWI. Historical evidence is still needed to assess the proposed causal links.
A MOMENT TO REFLECT
Put it to work.
Think of a recent decision you made. What would the consequences have been if you had chosen a different alternative?
Consider a strongly held belief you have. What hypothetical scenario would challenge that belief and reveal potential flaws?
How might you use a thought experiment to brainstorm innovative solutions to a recurring problem in your life or work?
Think of a recent historical event—can you construct a plausible alternative outcome by changing one small variable? What does that reveal about the event's causes?
When faced with an ethical dilemma, how might a thought experiment help you explore the consequences of each choice without real-world risk?
Often confused with
References
- The Problem of Abortion and the Doctrine of the Double Effect — Philippa Foot
- The Trolley Problem — Judith Jarvis Thomson
CONTINUE THE CONVERSATION
Source texts
- The Great Mental Models Volume 1 General Thinking Concepts
- Thinking in Systems and Mental Models Think Like a Super Thinker (Dawson, Marcus P)