Formative assessment happens while learning is still underway and feeds back into what’s taught next. Summative assessment evaluates what a student has achieved against a standard, usually once a unit or term closes. The dividing line isn’t the task itself, a quiz or essay can serve either purpose, it’s the purpose behind it and how the evidence gets used.
Key takeaways
- Formative and summative assessment differ by purpose and how the evidence is used, not by the type of task, and not simply by what happens to the result afterwards.
- The identical quiz, essay draft, or practical task can be formative in one classroom and summative in another, depending on the judgement it’s being used to make.
- Assessment isn’t valuable because it produces data. It’s valuable when that evidence leads somewhere, a change in teaching, targeted feedback, or a chance to revise (Bloom, 1968).
- Summative assessment involves a judgement against a standard or intended outcome. That same evidence can still be used formatively afterwards, if it goes on to shape how the next unit is taught.
- The most common mistake isn’t misusing a task, it’s calling something formative and then not changing anything afterwards.
What’s the actual difference between formative and summative assessment?
Timing is a useful clue, but it isn’t the definition. Formative assessment happens while learning is still underway, and its purpose is to shape what’s taught next. Summative assessment evaluates what’s been achieved against a standard or intended outcome, usually once instruction on a unit has closed (Carnegie Mellon University, Eberly Center, n.d.). The distinction that actually matters is purpose: what judgement the assessment is being used to make.
| Formative assessment | Summative assessment | |
|---|---|---|
| When it happens | Usually during learning, while there’s still time to respond | Usually at the end of a period of learning, when achievement is being evaluated |
| What it’s for | Adjusting teaching and giving students something to act on | Judging achievement against a standard or intended outcome |
| How the evidence gets used | Feeds back into the next lesson, task, or grouping decision | Confirms what was achieved, though it can still be used formatively afterwards |
| Typical stakes | Low or none, though this isn’t a strict rule | Medium to high, though not always |
The evidence base for formative assessment specifically is substantial: a 2024 meta-analysis of K-12 formative assessment research found consistent, measurable effects on student outcomes across subjects and year levels (Yao et al., 2024). But timing alone doesn’t settle which category a task belongs to. What settles it is the judgement the evidence is being used to make.
Why the same task can be formative in one classroom and summative in another
It isn’t the quiz, the essay, or the practical task that decides which category it falls into. It’s the purpose behind it, and how the evidence gets used. A ten-question vocabulary check run on a Monday morning, marked that lunchtime, and used to regroup Tuesday’s lesson is formative: the evidence changes what happens next. The identical ten questions run on a Friday afternoon could serve a summative purpose, if the result is used to judge what students have achieved against the unit’s learning goals. But if it’s simply marked, filed, and never referred to again, it isn’t doing useful formative work, and it isn’t providing a particularly meaningful summative judgement either. It’s just a result sitting in a gradebook.
This isn’t a new observation. Benjamin Bloom made the same point back in 1968: content and format don’t determine whether an assessment is formative or summative, purpose does (Bloom, 1968). Assessment isn’t valuable because it produces data. It’s valuable when the evidence leads somewhere: a change in teaching, targeted feedback, another opportunity to practise, a different question, or a chance for a student to revise their thinking. That chain, evidence, interpretation, then action, is the part that does the work. Skip the last step and the evidence just sits there, whatever the assessment was originally designed to do.
Using the data to guide decisions
Researchers working on classroom-based assessment make a similar point about the broader shift toward data-informed teaching: the real challenge is using the data well to guide decisions, rather than letting the existence of a score dictate what happens next by default (Hopfenbeck et al., 2023). And the relationship runs both ways. Summative assessment properly involves a judgement against a standard, measuring the level of proficiency reached at the end of an instructional unit (Carnegie Mellon University, Eberly Center, n.d.). But that same evidence doesn’t have to stop there: both formative and summative assessment data can go on to guide improvements, so results from a summative task can still be used formatively if they shape how the next unit gets taught (Carnegie Mellon University, Eberly Center, n.d.).
This reframes the planning question. Instead of asking “is this task formative or summative?”, the more useful question is “what judgement is this evidence being used to make, and when?” Answer that first, and the category sorts itself out.
Common mistakes with formative and summative assessment
- Calling something formative without changing anything afterwards. If the plan for next lesson was fixed before the results came in, the check wasn’t doing formative work, whatever it was labelled.
- Assuming “no grade” is the whole definition. An ungraded task that gets skimmed and filed isn’t doing useful formative or summative work. It’s just underused.
- Skipping the revision window on tasks meant to build toward a final judgement. A first draft graded straight through, with no chance to act on feedback before the mark locks in, wastes formative potential that was sitting right there.
- Running too many summative-style checks too close together. Frequent high-stakes testing eats into the instructional time needed to actually respond to what earlier results showed.
Does grading decide which is which?
Not on its own. Grading and stakes correlate with the formative/summative split, but they don’t define it. An ungraded, five-minute whiteboard check is formative because the teacher scans it and adjusts the next ten minutes of the lesson. But an ungraded quiz that gets skimmed, filed, and forgotten isn’t functioning formatively either, even though nothing about it looks high-stakes.
The reverse also holds. A graded draft that comes back with specific written feedback and a chance to revise before the final mark is locked in still has formative value, even though a mark sits on it. What matters is whether there’s a live opportunity to act on the feedback before the loop closes. It’s formative assessment, not summative, that closes the gap between where a student currently sits and the standard they’re working toward (Hattie & Clarke, 2018). Faster feedback loops make that action more likely: students are more inclined to revise their thinking while the task is still fresh in mind than once it has been filed away and moved past (Hattie & Timperley, 2007; Wisniewski et al., 2020).
A worked example, across three subjects
In Year 9 Science, a class is midway through a unit on cell biology. A quick five-question check on organelle function comes back showing half the class confusing mitochondria with chloroplasts. That evidence reshapes Thursday’s lesson into a targeted diagram-labelling task for the students who got it wrong, while the rest move on to the next concept. The check is formative because the result changed what happened next, not because of the task itself.
In Year 10 English, a draft paragraph that comes back annotated, with feedback and a chance to revise, is formative. The final graded version is summative, reporting what the student could do by the end of the process.
In Year 8 Maths, a pre-test can reveal prior knowledge before teaching begins, shaping how a topic is grouped and taught. An end-of-topic test then evaluates what the whole class achieved by the close of the unit.
None of these examples needed a special tool or a different kind of task to switch categories. They needed a teacher who knew, before setting the task, what judgement that evidence was going to be used to make.
FAQs
Is a quiz formative or summative assessment?
It depends on the purpose behind it and how the result gets used, not the quiz itself. A quiz used to adjust the next lesson is formative. The same quiz used to judge what students have achieved against the unit’s goals is summative. One that’s simply marked and filed does neither job well.
Is homework formative or summative assessment?
Usually formative, when it’s low-stakes practice with feedback that shapes what comes next. Homework that’s graded and counted toward a final mark, with no opportunity to act on the feedback, is functioning summatively.
Can one assessment be both formative and summative?
Yes, and not only in the way it first appears. A draft that gets feedback and a revision opportunity is formative; the finalised, graded version becomes the summative record of what was achieved. The relationship can run the other way too: results from a summative task, an end-of-unit test, for instance, can still be used formatively if they go on to shape how the next unit gets planned and taught.
How often should formative assessment happen?
There’s no fixed number. Formative assessment needs to happen often enough to give useful evidence while there’s still time to respond. The right frequency depends on the learners, the content, and where they are in the learning process.
Do summative assessments have to be formal exams?
No. End-of-unit tests are one form, but essays, practical tasks, presentations, and portfolios all serve a summative function. For example, you can use them to report what a student achieved at the close of a learning period.
Should formative assessment ever be graded?
It can be, without losing its formative value, as long as students still get feedback and a genuine chance to act on it before any mark is finalised. The grade isn’t the problem. A closed loop with no chance to revise is.
References
- Bloom, B.S. (1968). Learning for mastery. Instruction and Curriculum. Regional Education Laboratory for the Carolinas and Virginia, Topical Papers and Reprints, Number 1.
- Carnegie Mellon University, Eberly Center for Teaching Excellence & Educational Innovation. (n.d.). Assessing student learning. https://www.cmu.edu/teaching/designteach/teach/assesslearningteaching.html
- Carnegie Mellon University, Eberly Center for Teaching Excellence & Educational Innovation. (n.d.). Common assessment terms. https://www.cmu.edu/teaching/assessment/basics/glossary.html
- Hattie, J., & Clarke, S. (2018). Visible Learning: Feedback. London: Routledge.
- Hattie, J., & Timperley, H. (2007). The power of feedback. Review of Educational Research, 77(1), 81–112. https://doi.org/10.3102/003465430298487
- Wisniewski, B., Zierer, K., & Hattie, J. (2020). The power of feedback revisited: A meta-analysis of educational feedback research. Frontiers in Psychology, 10, 3087. https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2019.03087/full
- Yao, Y., Amos, M., Snider, K., & Brown, T. (2024). The impact of formative assessment on K-12 learning: a meta-analysis. Educational Research and Evaluation, 29(7–8), 452–475. https://doi.org/10.1080/13803611.2024.2363831
- Hopfenbeck, T.N., Zhang, Z., Sun, S.Z., Robertson, P., & McGrane, J.A. (2023). Challenges and opportunities for classroom-based formative assessment and AI: a perspective article. Frontiers in Education, 8, 1270700. https://doi.org/10.3389/feduc.2023.1270700
Related reading
- Formative assessment strategies: 15 practical examples for AU & NZ classrooms
- Summative assessment examples for the classroom
- Formative assessment examples by subject
Rachel Ellis, MA Applied Linguistics. Last updated: September 2026.
