IB Extended Essay Guide: How to Plan, Write and Score Well

Every IB student has to write one, and most students underestimate it until they are deep inside it. The Extended Essay is 4,000 words of independent research, supervised by a teacher, assessed externally by the IBO, and it carries real stakes: together with Theory of Knowledge, it can add 3 bonus points to your diploma total. A grade of E, on the other hand, fails the diploma outright. How you approach it from day one determines most of your outcome.

The IB Extended Essay is a 4,000-word independently researched essay, graded A to E by external IBO examiners. Combined with your Theory of Knowledge result, it can contribute up to 3 bonus points to your 45-point IB total. A grade of E fails the full diploma outright, regardless of subject scores.

What the Extended Essay actually is

The EE is one of the three core components of the IB Diploma, alongside Theory of Knowledge and CAS (Creativity, Activity, Service). Unlike TOK, it is a conventional academic essay: a focused, independently researched argument in a subject you choose. The IBO's official Extended Essay page and the Wikipedia overview of the Extended Essay are useful starting points for understanding the programme's formal requirements.

Key facts:

• Maximum 4,000 words. The IBO instructs examiners to stop reading at 4,000 words and not award marks for anything beyond that limit. Writing over the limit actively hurts your score.
• Graded A to E by external IBO examiners, not your school.
• Combined with TOK via the Core Points Matrix, the EE can add 0, 1, 2, or 3 bonus points to your diploma total.
• Grade E = automatic diploma fail, regardless of how well you did in your six subjects.
• Three mandatory supervisor reflection sessions must be documented on the Reflections on Planning and Progress Form (RPPF), which has a maximum of 500 words across all three entries.

One important note on criteria: the IBO introduced significant changes to EE assessment for students with a first assessment in May 2027 (those who started the IB Diploma in 2025 or later). If that is your cohort, some specifics below differ from your guide. The advice on topic choice, research process, writing, and timeline applies to everyone; check the IBO's official Extended Essay guide for your exact assessment criteria with your school coordinator.

Choosing your subject and research question

This is the most consequential decision in the whole EE process. A poorly chosen research question creates problems at every stage: it is too broad to answer properly in 4,000 words, too narrow to find sources for, or it drifts into another subject's territory.

Choose a subject you genuinely find interesting. You will spend 12 to 18 months with this question. A topic that looks impressive in September becomes oppressive by April if you are not actually curious about it.

Keep the research question focused and specific. "How does social media affect mental health?" is a dissertation topic, not an EE. "To what extent did the introduction of Instagram correlate with increased reported anxiety among UK adolescents aged 13 to 17 between 2012 and 2018?" is a question you could actually answer in 4,000 words.

Check your sources before committing. Before you finalise a research question, spend a few hours locating the sources you would need. A question with no accessible primary sources or reliable secondary literature will cost you marks in Knowledge and Understanding before you write a word.

Two research pathways are available: a subject-focused pathway within a single Diploma subject, and an interdisciplinary pathway drawing on two subjects. The interdisciplinary option rewards clear integration of two distinct disciplinary lenses. It is harder to execute well than it sounds, so only choose it if your question genuinely requires both subjects to answer properly.

Building a realistic timeline

The EE spans most of your two IB years. Most students who struggle have a simple problem: they did not start early enough, and the EE ends up colliding with IA deadlines and May exam revision.

A realistic framework:

• Year 1, term 2: finalise your subject and research question; first supervisor reflection session.
• Year 1, summer: complete the bulk of your research and note-taking; draft your outline.
• Year 2, September to October: write the first draft; second supervisor session with feedback.
• Year 2, November to January: revise the draft; prepare final submission; complete the RPPF; third supervisor session.

Your school will set its own internal deadlines, which are often tighter. The IBO specifies three mandatory supervisor sessions of 20 to 30 minutes each, and these sessions must be documented on the RPPF to count toward your Engagement criterion. Do not leave them until the final weeks; supervisors have full teaching timetables, and a rushed session gives much less useful feedback.

The real difficulty of the EE timeline is managing it alongside everything else: six subjects, IAs in multiple courses, TOK, and exam revision. While you are buried in EE research, your subject content keeps moving. Many students arrive at exam term and realise they have not seriously revisited Higher Level content since before Christmas.

This is the point where most students feel the strain. Root is an AI tutor designed by an IB student for exactly this kind of situation: an adaptive tutor that learns how your brain works and an AI manager of your studying that keeps track of what you keep getting wrong across all your subjects, so you do not have to figure out what to revisit. On the free plan, Root gives you 60 tutor messages a week, a revision mode that finds your weak topics and brings them back at the right intervals until they hold, and 2 exam-style practice tests a week with examiner-style per-question marking, all with no card details needed to start. See exactly what Root does, or set up a free account in a couple of minutes.

How your essay is assessed

For students on the pre-2027 criteria (first assessment before May 2027), the IBO assesses the EE against five criteria totalling 34 marks, according to the official Extended Essay guide:

Criterion C carries 12 of the 34 marks and is where most students lose the most ground. Describing what sources say earns a passing grade. Weighing what the sources mean, identifying where they contradict each other, and building a supported argument from them earns an A.

For students with first assessment in May 2027 or later, the IBO revised the criteria: the total dropped from 34 to 30 marks, the separate Presentation criterion was removed, and Evaluation now carries the most marks. The fundamental skill being rewarded is the same (argument over description), but check your school's version of the IBO guide for the exact breakdown.

The TOK and EE bonus points matrix

The Core Points Matrix combines your EE grade (A to E) with your TOK grade (A to E) to produce 0, 1, 2, or 3 bonus points added to your diploma total. An A in both earns the maximum 3 points. Most passing grade combinations in the B and C range produce 1 or 2 bonus points.

Two things matter most here:

First, an E in either the EE or TOK fails the diploma outright, regardless of any other score. This is the floor, and it does not move.

Second, the bonus points can make a genuine difference. Moving from a 37 to a 40 through subject marks alone requires exceptional performance in six subjects simultaneously. Picking up 2 to 3 core points is a much more achievable route to the same destination, and it is entirely within your control.

The most common mistakes

Research question too broad. The most common reason EEs underperform in Critical Thinking is that the question cannot be properly answered in 4,000 words, so the student ends up skimming the surface of a topic rather than analysing one part of it in depth.

Describing instead of analysing. Summarising what your sources say fills word count but does not earn marks in Criterion C. Evaluating the evidence, comparing sources, and using them to build a specific argument is what examiners are looking for.

Neglecting the RPPF. The Engagement criterion is worth 6 marks and depends entirely on your RPPF reflections. Students who treat supervisor sessions as a formality and fill in the RPPF at the last minute hand away marks that required no extra research.

Leaving referencing until the end. Consistent, accurate citations matter for the Presentation criterion (or its equivalent in the updated guide). Decide on your referencing format at the start and apply it throughout. Going back to add citations across a finished essay is slow and introduces errors.

Starting to write before the research is complete. Beginning to write while your argument is still unclear usually means rewriting large sections after your thinking has developed. Complete your research, settle on your thesis, and then write.

A note on using AI tools in your EE

The IBO's academic integrity policy applies to the Extended Essay. AI tools that write or substantially draft your essay would breach that policy; the research, the argument, and the writing must be your own. Tools that help you organise your notes, identify gaps in an argument, or understand complex source material sit in a different category, but check your school's specific guidance before using anything beyond your own note-taking.

Summary

The Extended Essay rewards students who start early, choose a focused research question, and engage genuinely with their sources rather than summarising them. Critical Thinking is where the marks are, and Critical Thinking means forming and defending an argument, not describing evidence.

Keep your supervisor relationship productive by treating the three required RPPF sessions as real working conversations, not administrative checkboxes. Do not let the RPPF become an afterthought.

For the broader challenge of managing the IB, including keeping six subjects fresh while your EE takes centre stage, see how to study for the IB Diploma, building a revision timetable, and how to stop procrastinating. Active recall and spaced repetition are the two methods with the strongest research evidence for keeping HL content solid over a two-year programme.