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Extended essay is an independent research project that you complete as part of the International Baccalaureate (IB) Diploma Programme. It runs up to 4,000 words and asks you to investigate a focused research question in a subject you choose. Unlike a standard class essay, you research and write it over several months with help from a supervisor.
The extended essay lets you carry out your own research instead of answering a set prompt. You pick a topic, ask a question, gather evidence, and build an argument from it.
Every IB Diploma candidate writes one. A teacher supervises your work, and you meet with them for short reflection sessions as you go.
It differs from a normal essay in both length and independence. A class essay might run a few pages from set readings, while the extended essay is a long, self-directed study with its own research question.
Most extended essays share a clear shape: a title page, a contents page, an introduction, the main body, a conclusion, and a list of references. The writing stays within the 4,000-word limit.
After reading this guide, you’ll know how to choose a subject, shape a research question, and write each part of the essay with confidence.
Table of contents
How to Write an Extended Essay in 5 Steps
The most important rule to know before you start is the length. An extended essay can run up to 4,000 words, and examiners stop reading once you pass that limit.
You also won’t work alone. A supervisor guides you through the project, and you complete three short reflection sessions that record how your thinking developed.
Examiners mark every essay against a fixed set of criteria, so it helps to know what they reward before you write.
Note
Examiners grade every essay against five criteria: focus and method, knowledge and understanding, critical thinking, presentation, and engagement. Critical thinking carries the most weight, so plan to analyze your evidence rather than just describe it.
Step 1: Choose Your Subject and Topic
Your first decision shapes everything that follows: which subject to write in.
Choose a Diploma subject you’ve already studied, since you’ll need its background and methods to do the research well.
Then narrow that subject to a specific topic. A broad field like “climate change” is far too wide, while “the effect of a local recycling scheme on household waste” is closer to the right size.
Check that real sources exist before you commit. If you can’t find books, articles, or data on a topic, you can’t build an answer around it.
Quick Tip
Pick a subject you find interesting and have already studied. You’ll spend months with it, and curiosity keeps a long project moving.
Step 2: Develop Your Research Question
With a topic chosen, your next job is to turn it into a research question. The question sets the limits of the whole essay and tells the reader exactly what you set out to answer.
A good question is narrow enough to answer in 4,000 words but open enough to need real investigation.
A strong research question is usually:
Focused enough to answer within the word limit
Specific rather than broad or general
Open to analysis, not a simple yes-or-no fact
Suited to the methods of your chosen subject.
For a history essay on the British home front, the question might look like this:
Example of an Extended Essay Research Question
To what extent did food rationing affect civilian morale in Britain between 1939 and 1945?
Notice that the question names a place, a period, and a single clear focus, which keeps the research within reach.
Step 3: Conduct Your Research
Now you gather the evidence that will answer your question. Research that is organized from the start saves hours once you begin writing.
Use both primary and secondary sources where you can. Primary sources are original materials such as letters, records, or raw data, while secondary sources are the books and articles in which other scholars interpret them.
Judge every source before you rely on it. Check who wrote it, when, and whether its claims hold up against other evidence.
A few habits keep your research in order:
- Record full source details the moment you use a source
- Keep your own notes separate from direct quotations
- Track every citation in a reference manager such as Zotero.
Step 4: Create an Extended Essay Outline
Before you write in full, plan the essay as an outline. An outline turns your research into an order of argument, so each section moves the answer forward.
Start from your research question and decide which sections it needs. Each part of the body should answer one piece of that question.
Plan roughly how many words each section gets. A common split gives the introduction about 500 words, the body around 3,000, and the conclusion about 400.
A sample outline for the rationing essay looks like this:
Example of an Extended Essay Outline
Introduction: the research question, background on rationing, and the essay’s scope
Section 1: the rationing system from 1939 to 1945 and how it changed
Section 2: the effects of rationing on daily life and diet
Section 3: morale, propaganda, and public response
Conclusion: a direct answer to the research question and its limits
Step 5: Write Your First Draft
With an outline ready, you can write the first full draft. Aim for complete rather than perfect, then improve it later.
Write toward the assessment criteria as you go. Keep your argument tied to the question, show your reasoning, and present your sources cleanly.
Quick Tip
Set aside short, regular writing sessions instead of leaving the essay to the last weeks. Steady progress over time works better than writing it all at once.
The three main parts of the essay each call for a different approach.
Write the Introduction
The introduction sets up your research question and shows why it matters. Give enough background for the reader to follow the topic, then state the question clearly.
Explain the scope as well: what the essay covers and what it leaves out. A focused introduction signals a focused essay.
An introduction for the rationing essay might open like this:
Example of an Extended Essay Introduction
During the Second World War, the British government introduced food rationing to manage scarce supplies and share them fairly. Rationing reached almost every household, shaping what people ate and how they viewed the war effort. This essay examines the extent to which food rationing affected civilian morale in Britain between 1939 and 1945. It focuses on official policy, daily experience, and wartime propaganda, while leaving aside the separate question of military supply.
Write the Body
The body is where you build and support your argument. Break it into clear sections, each making one point that helps answer the question.
Analyze your evidence rather than retell it. For every source, explain what it shows and why that matters for your question.
Watch out for the habits that cost the most marks:
- Summarizing sources instead of analyzing them
- Describing events without explaining their significance
- Adding quotations without your own comment.
Compare those habits with a short paragraph from the rationing essay:
Example of an Extended Essay Body Paragraph
Rationing did not lower morale as sharply as wartime planners had feared. Records from the Ministry of Food show that the weekly ration kept most households fed, even as choice narrowed (Calder, 1991). More telling is how people responded: community kitchens, allotment schemes, and shared recipes suggest that common hardship could strengthen resolve rather than weaken it. The evidence points to rationing as a source of complaint over detail, not a serious threat to wartime morale.
Write the Conclusion
The conclusion answers your research question in full. Pull together what the body has shown and state your overall finding clearly.
Don’t add new evidence here. You can note the limits of your study and point to where future research might go.
A conclusion for the rationing essay might read like this:
Example of an Extended Essay Conclusion
Food rationing affected civilian morale in Britain to only a limited extent between 1939 and 1945. Shortages caused frustration and the occasional protest, but the evidence suggests that rationing rarely threatened public support for the war. Shared sacrifice and steady government messaging often turned hardship into a sign of common purpose. These findings rest mainly on official records and published memoirs, so further work on private diaries could test how far the pattern held across regions.
Extended Essay Examples
Reading strong extended essays is one of the best ways to see what examiners want. As you read, look for a sharp research question, a clear structure, and analysis that goes beyond description.
The IB publishes sample extended essays with examiner comments across many subjects, from biology to history to English literature. Reading a few in your own subject shows you the standard to aim for.
Notice the difference analysis makes:
Example of Strong Analysis in an Extended Essay
Bread was never rationed during the war. The government feared that limiting such a staple would harm morale more than any shortage could, so it protected the supply even as other foods were cut. This choice shows how closely officials tied everyday food to public confidence.
The strength here is the move from what happened to why it mattered, which is exactly what the critical-thinking criterion rewards.
Common Extended Essay Mistakes
Most lost marks come from a short list of avoidable mistakes.
The most common ones are easy to name:
A research question that is too broad or too simple
A loose structure that hides the argument
Inconsistent or incomplete referencing
Going over the 4,000-word limit.
A weak research question is the biggest risk, since every other part depends on it. If the question is vague, the whole essay drifts.
Referencing causes trouble too. Choose one citation style early and use it the same way throughout.
Finally, respect the word limit. Examiners stop reading at 4,000 words, so anything important after that point won’t count.
One revision habit prevents many of these problems.
Quick Tip
Before you submit, read your essay once for each assessment criterion. Check that the question is focused, the analysis is clear, and the references are consistent.
Final Thoughts on the Extended Essay
The extended essay is a long project, but it follows a clear path: choose a subject, shape a question, research it, and write it section by section.
You now know what examiners look for and where students usually lose marks. With a focused question and steady work, the essay becomes far more straightforward.
Start early, keep your research question in view, and take the essay one section at a time.