Published on: June 23, 2026

Halfway through the IB diploma, most families have heard the letters IA more times than they can count, usually alongside a looming deadline. The IB internal assessment is one of the most misunderstood parts of the programme, partly because it is the rare exam mark a Learner earns long before the exam hall. Here is what an IA is, how it is graded, and how much it shapes a final IB grade.

What Is the IB Internal Assessment?

An IB internal assessment, or IA, is a piece of coursework a Learner completes for each subject, and the teacher marks using official IB criteria. A sample of those marks is then moderated by IB examiners, so the final grade reflects a global standard rather than one school's marking alone.

Every IB subject includes an IA. The work is done during the course rather than in a final exam, and it usually asks a Learner to investigate a question they have chosen themselves.

How Much Does the IA Count Toward Your Final Grade?

The IA usually counts for 20 to 30 percent of the final grade in a subject, depending on the subject and level. External exams make up the rest. A single subject grade from 1 to 7 comes from combining the moderated IA mark with the exam marks.

That weighting is worth pausing on. A fifth to nearly a third of each subject grade is decided through coursework that a Learner controls, with time to plan, draft, and improve, long before any exam.

How IA and Exams Combine

For most subjects, the split looks like this:

• The IA contributes roughly 20 to 30 percent of the subject grade.
• Written exams contribute the remaining 70 to 80 percent.
• The two are added together and converted into the final 1 to 7 grade using that session's grade boundaries.

What an IA Looks Like in Each Subject

The format of an IA changes from subject to subject, though the idea stays the same: independent work assessed against set criteria. The table below shows common examples.

Across all of them, examiners reward clear thinking, sound method, and honest reflection more than length.

How IA Marking and Moderation Work

Marking happens in two stages. The subject teacher marks the IA first, using the IB's published criteria for that subject. The IB then asks the school to send a sample of marked IAs, which external examiners review to check the school's marking against the global standard.

Moderation can shift marks. If a school has marked a cohort too generously or too harshly, the IB adjusts the marks for the whole group, up or down, to bring them in line. A Learner's own effort still shows through, but the final mark carries an external stamp of fairness.

Why the IB Internal Assessment Matters 

The IA rewards skills that exams cannot easily test, which is why it carries so much weight. Choosing a question, researching it, and writing it up over weeks is closer to university work than a timed paper. That head start is part of how the IB prepares Learners for university. For many Learners, a strong IA is the difference between a 6 and a 7 in a subject.

A few habits tend to separate strong IAs from rushed ones:

• Start early and choose a question of genuine interest.
• Keep the research question narrow enough to explore in depth.
• Use the IB criteria as a checklist while writing, not only at the end.
• Leave time to draft, get feedback, and revise.

What Skills Does the Internal Assessment Develop?

While the IA contributes directly to final grades, its value goes beyond assessment. The process allows Learners to experience the kind of independent work expected at university and in professional settings.

Through the Internal Assessment, Learners develop:

• Research skills by gathering, analysing, and evaluating information.
• Time management through long-term planning and milestone-based deadlines.
• Independent thinking by designing and investigating their own questions.
• Academic writing and communication skills through structured reporting and analysis.
• Reflection and problem-solving skills by reviewing their methods and refining their work.

These are the same skills that universities expect students to demonstrate in coursework, research projects, and dissertations, making the IA an important preparation for higher education.

How JBCN Supports Learners Through the IA

At JBCN International School, the International Baccalaureate Diploma Programme (IBDP) runs at Parel, Oshiwara, and Chembur, where Learners have maintained a 100% pass rate. Steady IA support is a large part of how those results hold year after year.

Each Learner follows a Strategic Individual Excellence Plan, with mentoring for Internal Assessments and the Extended Essay, and a calendar of interim deadlines that keeps the work moving rather than piling up. Educators guide method and structure within IB rules, while the thinking and writing stay the Learner's own.

For families weighing what the diploma builds beyond grades, the wider benefits of the IBDP are a useful read.

Take the Next Step

A clear picture of the IA is reassuring, but seeing how a school guides Learners through it tells you more. Choosing a question, drafting it, and meeting deadlines over weeks is hard to judge from the outside. The best way to understand the support behind a strong IA is to spend a little time with the educators who mentor it.

Speak with our admissions team or visit a campus to meet the IB educators who mentor Learners through their coursework.

Share