Formative vs summative assessment: 5 key differences (For IB & International Schools)

Most teachers can feel the difference between formative and summative assessment long before they can define it. One is the quick check you run mid-lesson to see if the point landed. The other is the test that goes in the gradebook. This guide is for IB, Cambridge and Pearson teachers and coordinators who want the formative vs summative assessment distinction set out plainly, then mapped onto the way your curriculum actually works: IB DP internal assessment and terminal exams, MYP criteria, Cambridge coursework and final papers, Edexcel units. By the end you'll be able to say which is which, and, more usefully, decide when to use each.

Formative vs summative assessment comes down to purpose: formative assessment is the low-stakes checking you do during learning to adjust your teaching, while summative assessment is the graded judgement of what students have learned at the end of a unit, course or year. Formative is for learning; summative is of learning, and the same piece of work can do either job depending on when and why you use it.

TL;DR

What is formative assessment?

Formative assessment is any low-stakes check you run while students are still learning, so you can act on what you find straight away. It is usually ungraded, happens inside normal lessons, and exists to change what you do next.

A quick example: you ask a hinge question halfway through a lesson, see that a third of the class has the wrong idea, and reteach that point before moving on. That is formative assessment, and it took two minutes. Exit tickets, mini-whiteboard polls and short retrieval quizzes all do the same job. For the full set, see our 20 formative assessment examples for the digital classroom, and for the deeper background, what formative assessment is and why it works.

On an on-screen assessment platform these checks run digitally and come back marked the second students submit, which is what makes running them often realistic.

Formative assessment earns its keep by changing the next lesson, not by filling the gradebook.

What is summative assessment?

Summative assessment is the higher-stakes, graded judgement of what students have learned at the end of a unit, course or year. It measures achievement against a standard or set of criteria, and the result is recorded and reported.

End-of-unit tests, IB DP terminal exams and Cambridge IGCSE final papers are all summative. The point is no longer to adjust teaching for these students; it is to certify what they can do. Summative results travel: to the next teacher, to the school's data, to an exam board, to a university. That is why they carry weight and why students feel them.

With AssessPrep, summative exams run as secure, on-screen assessments built from a question bank, with AI grading to take the load off open-response marking.

Summative assessment is the moment the learning gets measured, reported and remembered.

Formative vs summative assessment: 5 key differences

The difference between formative and summative assessment shows up across five dimensions: purpose, timing, stakes, who uses the data, and effect. The table gives you the side-by-side; the five points below add a worked example for each.

1. Purpose: For learning vs of learning

Formative assessment exists to inform teaching; summative assessment exists to judge achievement. This is the difference that everything else hangs off. A hinge question mid-lesson tells you what to reteach; an end-of-unit grade tells the school what a student achieved. Same subject, different jobs. Once you are clear on purpose, the other four differences follow.

2. Timing: During vs at the end

Formative assessment happens while learning is still in progress; summative assessment happens once it is finished. Weekly retrieval starters across a biology unit are formative because there is still time to act on them. The IB DP terminal exam in May is summative because the course is over. Timing is the easiest tell: if you can still change the outcome for these students, it is formative.

3. Stakes and grading: Low vs high

Formative assessment is low-stakes and usually ungraded; summative assessment is high-stakes and graded against standards or criteria. An ungraded exit ticket invites honesty, because nothing rides on it, so students will often show you what they genuinely do not understand. A Cambridge IGCSE terminal paper, sat at the end of the course and reported on the eight-point grade scale from A to G, is the opposite: it is graded, it counts, and students prepare for it accordingly.

It is worth being honest about the trade-off, though, because stakes can distort accuracy in both directions. When nothing rides on a check, some students disengage or rapid-guess, which undercuts how much the score actually tells you. When everything rides on a test, the pressure can corrupt the measure the other way: sustained high stakes are the conditions Campbell's law warns about, where teaching narrows to the test and scores inflate faster than real learning. So neither setting is automatically the truer measure. The job is to match the stakes to the purpose: low-stakes checks to find out what students do not yet understand, and high-stakes exams to certify what they can do. That difference in who reads the result, and when, is the next point.

4. Who uses the data, and when

Formative data is for the teacher and student to use immediately; summative data goes to the school, board or university later. When a class poll shows 11 of 28 students missed the same step, that is yours to act on tomorrow morning. When you submit final grades, that data leaves your hands and becomes part of a transcript. Formative information is a working tool; summative information is a record. And those two roles pull teaching in different directions, which is the last difference.

5. Effect: Changes the next lesson vs reports the result

Formative assessment changes what you teach next; summative assessment reports what was learned. A Tuesday check that reshapes Friday's plan is doing formative work. The end-of-term report is doing summative work: it states the result without changing it. This is the cleanest way to settle an argument about which is which. Ask what the assessment did. If it altered teaching, it was formative. If it recorded an outcome, it was summative.

Here is the catch that trips people up. The same task can be either, depending on intent. A past paper used mid-unit to diagnose gaps is formative; the identical paper used as the end-of-term grade is summative. So when someone asks for formative vs summative assessment examples, the honest answer is that many tasks belong to both lists. What decides it is whether you act on the result or simply record it. Because one platform draws both from the same question bank, a diagnostic check and a terminal exam can be the same item used two ways, and you can see who understands before the graded exam.

Don't ask whether a task is formative or summative; ask what you did with the result.

Start your 30-day free trial. Run formative checks and secure summative exams on one platform, built for IB, Cambridge and Pearson schools, with AI grading and instant class results. Start your free trial →

Formative vs summative assessment in IB, Cambridge & Pearson

The formative and summative split looks slightly different in each curriculum, because each one judges students differently. The logic holds; only the framing changes. This section is about which assessments count as formative and which as summative in each system. For how to actually run the formative checks themselves, curriculum by curriculum, the formative assessment guide covers that.

IB DP

In the IB Diploma Programme, mock exams and internal assessment drafts are formative checkpoints; the May or November terminal exams and the final IA submission are summative. A mock is most useful when you treat it as the last big formative read before the real thing, not as an early verdict. For the coordinator's view of how DP assessment fits together, see a coordinator's guide to IB DP assessment principles and the IB DP platform.

IB MYP

In the MYP, assessment is criterion-related, so the same criteria are judged formatively along the way and summatively at the end. Day-to-day criterion tasks are formative; the on-screen MYP eAssessment is the summative endpoint for the certificate. This is where the formative-to-summative path is most explicit, and where AssessPrep's criterion-based on-screen tasks fit most naturally; the IB MYP platform is set up for it.

Cambridge IGCSE & A-Level

For Cambridge International, topic tests, practical work and coursework components act as formative practice, while the terminal IGCSE and AS & A Level papers are summative. The everyday checks track progress against the published assessment objectives, which carry set weightings in each syllabus, so the final papers hold no surprises.

Pearson Edexcel

For Pearson, unit tests and mock papers are formative, while Edexcel and IAL terminal exams and BTEC assignments are summative. Edexcel's modular International A Level structure, where exams are sat at the end of each unit, means a formative check can sit neatly before each unit assessment. AssessPrep spans all of these from one platform, so a school running mixed boards is not juggling separate tools. See Other Curricula for the Edexcel setup.

In an IB school, formative and summative aren't a debate; they're the rhythm of the year, from the first hinge question to the final paper.

When to use each: Balancing formative and summative across the year

The real skill is not choosing formative or summative; it is balancing them across the year so the two feed each other. Frequent formative checks shape your teaching, the summative assessment judges the result, and that result should rarely surprise anyone who was paying attention to the formative signals.

Programmes that lean too far into summative testing burn students out and find out about problems too late. Programmes with only formative work never measure whether it added up. The balance is the point. A DP coordinator we work with stopped treating the mock exam as an early grade and started using it as the last formative checkpoint before May, and saw far fewer surprises in the terminal results. For how to make feedback actually change the next piece of work, see mastering IB MYP assessments.

This is also where international and US-district vocabulary diverge. If you work in a US K-12 context and want the language of interim and benchmark tests, what sits between daily teaching and the final exam covers that lens specifically.

A good summative result is one the formative data already predicted.

Running both on one digital assessment platform

The practical problem in most schools is that formative and summative assessment live on different tools, so the data never joins up. Paper exit tickets stay in a drawer; the exam system holds the grades; nobody can see the line connecting the two.

One on-screen platform fixes that. Formative checks and secure terminal exams come from the same question bank, AI grading handles open responses, and analytics connect the formative trend to the summative result. The evidence for bothering is strong: feedback during learning sits around an effect size of 0.73 in John Hattie's research, and Black and Wiliam's review put the gains from good formative work between 0.4 and 0.7. AssessPrep is used in 800+ schools across 85+ countries, with over 5 million student submissions and more than 1 million teacher hours saved, much of it on exactly this kind of joined-up assessment. You can build a quick formative check and a secure summative exam from the same place, and AI grading keeps the marking manageable.

When formative and summative run on one platform, the grade stops being a surprise and starts being a conclusion.

Conclusion

Formative vs summative assessment is not really a contest. Formative assessment is for learning and summative assessment is of learning, and a school needs both: the quick checks that tell you what to do next, and the graded judgements that record what students achieved. The trap is treating them as opposites, or running them on separate tools so the data never meets. Keep the formative checks frequent and low-stakes, let them shape your teaching, and the summative result becomes something you saw coming. Start with the difference in purpose, map it onto your own curriculum, and the rest falls into place.

Key Takeaways

• Formative assessment is for learning (during a unit, low-stakes, changes teaching); summative assessment is of learning (at the end, high-stakes, reports the result).

• The five differences are purpose, timing, stakes, who uses the data, and effect. The cleanest test is what you did with the result.

• The same task can be formative or summative depending on intent: a past paper diagnoses (formative) or grades (summative).

• In IB, Cambridge and Pearson, mocks, IA drafts and topic tests are formative; terminal exams, MYP eAssessment and final IA submissions are summative.

• Run both on one platform so formative data predicts the summative result instead of arriving too late to matter.

References

• Black, P., & Wiliam, D. (1998). Inside the Black Box: Raising Standards Through Classroom Assessment. London: GL Assessment. Companion review: Black, P., & Wiliam, D. (1998). "Assessment and Classroom Learning." Assessment in Education, 5(1), 7–74 (reported formative effect sizes of 0.4–0.7).

• Hattie, J. (2009). Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement. London: Routledge (feedback effect size d≈0.73; average benchmark d=0.40).

• International Baccalaureate Organization (2018). Assessment Principles and Practices: Quality Assessments in a Digital Age.

• Cambridge Assessment International Education. Cambridge IGCSE qualification (assessment at the end of the course; terminal examinations; eight-point grade scale). https://www.cambridgeinternational.org/programmes-and-qualifications/cambridge-upper-secondary/cambridge-igcse/qualification/

• Cambridge Assessment International Education. Cambridge International AS & A Levels (two-year course; assessment objectives with set weightings per syllabus). https://www.cambridgeinternational.org/programmes-and-qualifications/cambridge-advanced/cambridge-international-as-and-a-levels/

• Pearson. Edexcel International Advanced Levels (modular unit structure; exams sat at the end of each unit). https://qualifications.pearson.com/en/qualifications/edexcel-international-advanced-levels/about.html

• Wise, S. L., & DeMars, C. E. (2005). "Low Examinee Effort in Low-Stakes Assessment: Problems and Potential Solutions." Educational Assessment, 10(1), 1–17 (disengagement and rapid-guessing reduce the validity of low-stakes scores). https://www.tandfonline.com/doi/abs/10.1207/s15326977ea1001_1

• Campbell's law and high-stakes testing. Harvard Graduate School of Education, "When Testing Takes Over" (high-stakes pressure drives score inflation and gaming). https://www.gse.harvard.edu/ideas/usable-knowledge/17/11/when-testing-takes-over

• Low-stakes assessments in secondary and further education: a systematic literature review (2025), via ScienceDirect. https://www.sciencedirect.com/science/article/pii/S2590291125010514