For students in the IB Diploma Programme, the Internal Assessment is one of the most significant pieces of academic work they will produce in high school. Whether you are completing a Math IA exploration, a Chemistry HL lab investigation, a History HL paper, or an English individual oral, the IA carries real weight, typically accounting for 20 to 30 percent of your final subject grade. And unlike the final exams, which come at the end of your Diploma year, the IA is entirely under your control.
The challenge is that most students do not realize how early they need to start, or how much guidance is needed to choose a topic that is genuinely researchable and appropriately scoped. This guide walks through everything you need to know to produce an IA that earns strong marks, regardless of your subject.
What Is the IB Internal Assessment and How Much Does It Count?
The IB Internal Assessment is a subject-specific, externally moderated piece of work that is assessed internally by your teacher and then sent to the IB for external moderation. Every IB subject has a different IA format, but the purpose is consistent: to allow students to demonstrate independent inquiry and subject-specific skills within a topic of personal interest.
Here is how much the IA contributes to the final grade in common HL subjects:
| Subject | IA Type | IA Weighting |
|---|---|---|
| Mathematics AA HL / AI HL | Mathematical Exploration | 20% |
| Chemistry HL | Individual Investigation | 20% |
| Biology HL | Individual Investigation | 20% |
| Physics HL | Individual Investigation | 20% |
| History HL | Historical Investigation (2,200 words) | 25% |
| Economics HL | Portfolio (three commentaries) | 20% |
| English Literature HL | Individual Oral | 20% |
| Psychology HL | Experimental Study | 25% |
Because the IA is externally moderated, your teacher’s marks can be adjusted up or down by the IB examiner. This is why it is critical to understand the actual IB rubric criteria, not just what your school emphasizes.
How Do You Choose a Strong IB Internal Assessment Topic?
The most important decision in your IA is choosing a topic that is specific, original, and genuinely investigable within the constraints of the subject. A broad or poorly defined topic is the single biggest reason students earn low marks on the IA, regardless of how well they write or how much effort they put in.
According to experienced IB educators, the best IA topics share three characteristics:
- Appropriate scope: The topic should be narrow enough to investigate thoroughly within the word or page limit. For a Math IA, "calculus" is far too broad; "modelling the spread of a social media trend using logistic growth functions" is well-scoped.
- Genuine personal interest: IB examiners explicitly reward personal engagement. Students who connect their IA to a real interest, an observation from daily life, or a question from their local context consistently write stronger work.
- Access to data or a clear investigative method: Before committing to a topic, ask yourself what data you will collect or what experiments you will run. Students at IB schools like Upper Canada College, Branksome Hall, and Havergal College often have access to excellent lab equipment, but the investigation still needs a clear design from the start.
A useful test for any proposed IA topic: can you frame it as a clear, specific research question? If not, the topic is not yet narrow enough.
What Timeline Should You Follow for Your IB Internal Assessment?
Most IB schools begin the IA process in Grade 11, with completion expected by November of Grade 12. Here is a realistic timeline for most HL subjects:
- March to May (Grade 11): Begin exploring potential IA topics. Discuss ideas with your teacher and, if you are working with a tutor, review what strong past IAs in your subject look like.
- June to August (between Grade 11 and 12): Finalize your research question. Begin any data collection or experiment design. For sciences, run a pilot experiment before the school year begins if possible.
- September to October (Grade 12): Complete your first full draft. Get feedback from your teacher and make substantive revisions.
- November (Grade 12): Submit your final IA to your teacher for internal assessment.
Students who leave topic selection until September of Grade 12 are already behind. Based on our work with students at top IB schools across Canada and the US, those who begin the process in the spring of Grade 11 consistently produce stronger work and experience less stress during the critical Grade 12 exam period.
What Are the Most Common IB Internal Assessment Mistakes?
After working with hundreds of IB students, these are the mistakes that most reliably cost marks:
- Ignoring the rubric criteria: Every IA has specific assessment criteria published by the IB. Students who write without referring back to these criteria miss obvious opportunities to earn marks.
- Choosing an overused topic: Examiners moderate thousands of IAs per year. A topic that has been done too many times will not score well on the personal engagement criterion unless it has a genuinely original angle.
- Treating it like a school essay: The IA is not a classroom assignment. It requires independent inquiry, not just summarizing what you have learned. This distinction trips up even strong students.
- Weak analysis or evaluation: In sciences, students frequently describe what happened in their experiment but fail to critically evaluate their methodology, address sources of error, or compare their findings to accepted values.
- Poor structure and presentation: The IA should read like a focused, well-organized piece of academic writing with a clear introduction, methodology, analysis, and conclusion. Inconsistent formatting or citation style creates a poor impression with examiners.
How Can a Tutor Help With the IB Internal Assessment?
A strong IB tutor can provide guidance that most classroom teachers are not able to offer, simply because of time constraints. A tutor who has taught IB at the classroom level can help a student identify a strong research question, review drafts with genuine knowledge of IB rubric expectations, and provide honest subject-specific feedback that reflects what an examiner would look for.
This is especially valuable for the Math IA, where many students are unsure how to incorporate the required level of mathematical sophistication, and for the sciences, where students need to design a rigorous methodology before they collect any data. Support from an experienced IB educator at the right stage in the process can prevent weeks of wasted effort and significantly improve the final mark.
You can explore the full range of subjects Polaris Tutors supports for IB Diploma students at the HL and SL levels.
Frequently Asked Questions About the IB Internal Assessment
How long should an IB Internal Assessment be?
It depends on the subject. Math IAs should be 6 to 12 pages. Science IAs in Biology, Chemistry, and Physics have no strict word limit but typically run 6 to 12 pages. History IAs are capped at 2,200 words. English individual orals run 10 minutes. Always check the most current IB subject guide for your specific subject and examination year.
Can I get help from a tutor on my IB Internal Assessment?
Yes, within limits. A tutor can help you choose a topic, refine your research question, give feedback on drafts, and explain what each rubric criterion requires. A tutor cannot write the IA for you or collect your data. The work must be authentically your own. Experienced IB tutors understand where this line is and are careful to stay on the right side of it.
What makes a good IB Math Internal Assessment topic?
A strong Math IA topic involves genuine mathematical content at or above the level of the course, a clear personal motivation or real-world connection, and a focused research question the student can explore using techniques they truly understand. Good examples include modelling real-world phenomena with differential equations, analyzing properties of sequences in music or nature, or applying probability to a sport or game the student knows well.
When are IB Internal Assessments sent to the IB for moderation?
Typically, teachers submit IA samples to the IB for moderation in April of the final Diploma year. The IB selects a sample from each school, and if the examiner’s marks differ significantly from the teacher’s marks, the entire cohort’s scores are adjusted. This is why IA quality matters even if your teacher gives you a high mark internally.
What is the difference between the IB Internal Assessment and the Extended Essay?
The IB Internal Assessment is a subject-specific piece of work completed in each of your six Diploma subjects. The Extended Essay is a separate 4,000-word independent research paper written in one subject of your choice. The Extended Essay counts toward your Core points, while the IA contributes directly to your subject grade. Both are required for the IB Diploma, but they are assessed independently.
The IB Internal Assessment is one of the most consequential pieces of work in the Diploma Programme, and the students who do best are those who start early, choose a well-scoped topic, and understand the assessment criteria from the beginning. With the right approach, the IA can also become one of the most genuinely rewarding academic experiences in the IB.
If you are an IB student or a parent looking for guidance on Internal Assessments, Polaris Tutors works with Diploma students across all six subject areas. Our tutors are experienced IB educators who understand what examiners look for and how to help students produce their best work. Get in touch to learn more about how we can support your child’s IA.