Which subject should you choose for your Extended Essay?

Choose the Extended Essay subject in which you can ask a narrow question you genuinely want answered, get real evidence to answer it, and have a supervisor available. For most students that is a subject they take, often at HL, because you already have the concepts and know the subject's methods. Asking which subject is "easiest" gets you nowhere: every EE is marked on the same five criteria, so the difficulty comes from the fit between you, your question and your evidence, not from the subject.

What should decide your EE subject?

Run each subject you are considering through these five tests. The one that passes all five is usually your answer.

If two subjects pass, pick the one where you can already write three candidate research questions. If you can't write any, the interest isn't specific enough yet.

Why is "easiest EE subject" the wrong question?

Because the rubric is the same everywhere. Criteria A to E apply to every subject-focused and interdisciplinary essay, so no subject has an easier marking scheme. Some subjects make certain things easier: a lab subject gives you data to analyse, while a literature essay needs only the text. Each also has its own way to go wrong. An essay feels "easy" only when the student has a well-focused question and the right evidence.

Ignore subject rankings you find online. Even where they cite averages, those numbers can reflect who chooses each subject as much as how hard it is, and they come from the old marking model. They tell you nothing about the essay you would write.

What are the strengths and traps of each subject?

Biology, Chemistry and Physics

Strengths: data to analyse, clear variables, and IA skills that carry over (statistics, uncertainties, graphs). Published data sets are an option if lab access is tight.

Traps: you need an investigation design, not just an experiment. That means controlled variables, enough data points, a pilot run, and safety and ethics approval before you start. An EE that is a bigger version of a standard IA practical rarely has enough to discuss. And lab time in Year 2 competes with every IA in the school.

Mathematics

Strengths: no lab, no archives, and a clear right or wrong at each step.

Traps: strong maths EEs usually go beyond the course, but every step still has to be explained so that a classmate could follow it. Students either stay inside the syllabus, which leaves little to analyse, or go so far beyond it that they reproduce proofs they can't explain, which shows up in the viva. Choose a topic where you can explain every line.

ESS

Strengths: fieldwork or public environmental data, and questions that connect science to management or society.

Traps: a pure ecology question belongs in Biology; ESS wants the environmental-systems or management angle. Fieldwork is seasonal, so the question has to be fixed before the season. ESS can only be used in the subject-focused pathway, not as one of two interdisciplinary subjects.

Psychology

Strengths: rich published research and real debates to evaluate.

Traps: collecting data from people is limited by ethical guidelines (consent, no harm, care with minors), so many psychology EEs are built on published studies. That works only if you evaluate the studies, not summarise them. Check any plan for primary data with your supervisor first.

Economics

Strengths: real policies and markets, public data, and theory that gives you a framework.

Traps: essays that describe a policy without using economic theory to explain it, or that use theory without data that actually tests it. One concept applied precisely beats five mentioned in passing.

Global Politics

Strengths: current, specific cases and plenty of official documents.

Traps: narrating events instead of analysing them through political concepts such as sovereignty, legitimacy or power. Very recent events may have little scholarly analysis yet.

History

Strengths: a clear tradition of argument from sources, and well-defined questions.

Traps: you need sources you can actually read, and enough of them; a topic whose primary sources are in a language you don't read, or sit in a closed archive, won't work. Evaluating sources (who made them, when, why) is not optional. Check your school's guidance on how recent a topic can be.

English A and other languages

Strengths: the text is your main evidence, and you can start reading today.

Traps: you need a strong literary argument, not a theme list or plot summary. Critics should support your reading, not replace it. The old categories for language A and B essays have been removed, so you have more freedom in what you study and need more discipline in narrowing it.

Should you choose the interdisciplinary pathway?

From May 2027, you can write either a subject-focused EE in one subject or an interdisciplinary EE that integrates two DP subjects. The interdisciplinary pathway absorbs the old world studies option. The rules that matter when choosing:

• The IB strongly recommends that you study at least one of the two subjects.
• The two subjects don't have to carry equal weight.
• ESS and literature and performance can't be one of the two subjects.
• At registration you place the essay in one of five frameworks: power, equality and justice; culture, identity and expression; movement, time and space; evidence, measurement and innovation; or sustainability, development and change. The framework itself isn't assessed.
• For now, interdisciplinary essays must be written in English, French or Spanish.
• Both pathways are marked against the same criteria.

It suits you if your question genuinely can't be answered by one subject alone: the economic value of a biological process, the chemistry behind a historical turning point, how accurately a novel depicts a psychological condition. The trap is two half-essays stapled together, which neither subject's knowledge can fully support. You'll also want a supervisor comfortable with both subjects. For examples, see the interdisciplinary section of EE research question examples.

How can you test a subject before committing?

Give each finalist subject a one-week test before you tell your coordinator:

1. Write three candidate research questions.
2. For the best one, find five usable sources or one usable data set.
3. Sketch the method in a paragraph: what evidence, collected how, analysed how.
4. Ask the teacher who might supervise you whether the question is the right size.

If step 2 fails, the subject fails, however much you like it. If it passes, you have most of what your first reflection session needs. The Extended Essay guide shows what comes next.

What if you are submitting in November 2026?

You are on the old model, where world studies was a separate option and language A essays still had categories. The five tests above apply unchanged. Check your school's EE handbook for the old rules on each subject.