The big idea: The five theories are different lenses on the same world. No single one is 'the truth'.
How to use them
- Each lens highlights something real and misses something else.
- The exam skill is to use them together: pick the lens that fits, and weigh them against each other.
Realism, liberalism, constructivism, feminist and post-colonial theory are not a menu to choose one from and forget the rest. They are tools. A strong answer applies more than one, showing what each reveals about the same event.
- Realism — states seek power and survival in a self-help world (explains conflict).
- Liberalism — cooperation is possible through trade, institutions and democracy.
- Constructivism — ideas and identities shape what states want (explains change).
- Feminist — gender shapes power; women's experiences are left out.
- Post-colonial — the legacy of empire shapes today's inequalities.
'Mainstream' vs 'critical': Realism and liberalism are often called the mainstream theories (they debate how states pursue interests). Constructivism, feminist and post-colonial theory are more critical — they ask where interests come from and who is left out. Knowing this contrast is a quick way to structure an essay.
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The best way to see the difference is to point all five lenses at the same event. Take a war between two states and ask what each theory says.
Case study — five lenses on one war: Take one war and look at it through each of the five lenses. Each lens explains a different part of it.
What each lens sees
- Realism: the war is a struggle for power and security in an anarchic world.
- Liberalism: it happened because cooperation, trade or institutions failed — and could be prevented by them.
- Constructivism: the two sides see each other as enemies because of ideas and identity, which could change.
- Feminist: the war hits women and men differently, and women are absent from the decisions and the peace.
- Post-colonial: the conflict may have colonial roots — borders or divisions imposed by empire.
None of these is wrong. Each catches a real part of the same war. That is the point of comparing theories: the fullest understanding comes from layering the lenses, not picking one.
The key point: Comparing theories means applying several lenses to one event and weighing what each reveals and misses. The mark of a strong answer is not loyalty to one theory but the ability to use them against each other and reach a judgement.
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So how should you use the theories in the exam? Here is how to choose and combine them.
How to structure a theory essay: 1. Pick two or three lenses that fit the question. 2. Apply each to the same event, showing what it reveals. 3. Weigh them — what does each miss? 4. Reach a judgement: which lens explains this case best, and why. Using theories against each other is what earns the top marks.
How comparing theories comes up in Paper 1: A Paper 1 source can be read through several theories at once. The top skill is to apply more than one lens and show what each one reveals that the others miss.
Evaluate the usefulness of using more than one theory to understand a global political event.
Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Easy marks to lose: 1. Describing theories one by one. Compare them on the same event.
2. Treating one theory as 'the answer'. Weigh what each misses.
3. No judgement. 'Evaluate' needs you to decide which fits best.
4. Forgetting the critical theories. Constructivism, feminist and post-colonial add what realism/liberalism miss.