Inquiry-based learning: what it is, how much guidance it needs, and what the research says
Students learn by investigating questions (observing, predicting, testing and explaining) rather than being told the answer first, with the teacher guiding how much they work out themselves.
What the research says
- Strong
- Promising
- Mixed
- Thin
- Contradicted
Mixed, and the line runs through guidance. A meta-analysis of 37 experimental studies of inquiry-based science teaching found a positive overall effect, much larger when inquiry was teacher-led than student-led. A meta-analysis of 72 studies found guidance during inquiry improved learning, and a meta-analysis of discovery learning found unassisted discovery did worse than explicit teaching while supported discovery did better. Inquiry works when the teacher structures it; leaving students to find things out alone doesn't.
Rated Mixed. One synthesis supports it. Two rigorous studies found it works only in some forms or for some students. Two reviews or weaker studies add context but don't move the rating. None of the supporting studies is recorded here as done with school-age children. How we rate the evidence
Checked against each source in October 2026.
The studies behind this rating
Inquiry-based science teaching had a positive overall effect on learning. Studies where students did the reasoning work of science (explaining, arguing from evidence) had the largest effects, and teacher-led inquiry had much larger effects than inquiry led by students.
Sample 37 experimental and quasi-experimental studies published 1996–2006Effect overall mean effect size .50; teacher-led activities about .40 larger than student-ledRead it at the source (opens in a new tab)Compared inquiry with more guidance to inquiry with less: guidance improved what students did, how well they did it and what they learned. Support for guided inquiry, not for leaving students to inquire alone.
Sample 72 studies comparing types of guidance across age groupsEffect guidance: d = 0.66 on learning activities, d = 0.71 on performance success, d = 0.50 on learning outcomesRead it at the source (opens in a new tab)Unassisted discovery did worse than explicit instruction (d = −0.38), while discovery with support (feedback, worked examples, scaffolding, explaining) did better than other teaching (d = 0.30).
Sample Two meta-analyses of 164 studies: 580 and 360 comparisonsEffect unassisted discovery vs explicit instruction d = −0.38; enhanced discovery vs other instruction d = 0.30Read it at the source (opens in a new tab)A reply to Kirschner, Sweller and Clark: problem-based and inquiry learning are highly scaffolded, so they shouldn't be grouped with unguided discovery. The authors present evidence that both are effective, use scaffolding to reduce cognitive load, and serve goals such as collaboration and self-directed learning as well as content knowledge.
Drawing on how working memory works and on half a century of studies, the authors argue that minimally guided teaching is less effective and less efficient for novices than teaching with strong guidance. The advantage of guidance shrinks once learners know enough to guide themselves.
What it is
Inquiry-based learning puts a question before the answer. Instead of explaining that plants grow toward light and then doing an experiment to confirm it, the teacher asks "What do plants need to grow?", and students predict, set up a test, observe and explain what happened. The content is the same; the order and who does the thinking change.
It's most associated with science, where it mirrors how scientists work, but it's used in math ("What patterns do you notice in this table?"), history ("What do these three sources tell us about why the town moved?") and reading.
Inquiry comes in levels, from most to least guided:
- Confirmation: students follow a procedure to confirm something they've been taught.
- Structured inquiry: the teacher gives the question and the method; students work out the answer.
- Guided inquiry: the teacher gives the question; students help design the method.
- Open inquiry: students choose the question and the method.
Much of the argument about inquiry comes from mixing these up. "Inquiry" in one study can mean a carefully scaffolded lesson where the teacher leads the reasoning, and in another, students left with materials and a question. The research treats these very differently.
Why it works
The argument for inquiry is that working out an idea makes it stick and makes it mean something, and that students learn how knowledge is made (how to ask a testable question, read evidence, argue from data), not just what is known.
The argument against unguided inquiry is about working memory. Paul Kirschner, John Sweller and Richard Clark argued in 2006 that novices learning new material through minimally guided methods have too much to juggle at once: the content, the method, and what to do next. They grouped inquiry with unguided discovery. Cindy Hmelo-Silver and colleagues replied that inquiry and problem-based learning, done well, are highly scaffolded, which makes them a different thing from unguided discovery.
The meta-analyses support both sides, in their own terms. Erin Furtak and colleagues coded 37 experimental and quasi-experimental studies of inquiry-based science teaching and found a positive overall effect. The largest effects came where students did the reasoning work of science (explaining and arguing from evidence), and teacher-led inquiry had much larger effects than student-led inquiry.
Louis Alfieri and colleagues pooled 164 studies of discovery learning. Unassisted discovery did worse than explicit instruction under most conditions. Discovery with support (feedback, worked examples, scaffolding, asking students to explain) did better than other forms of teaching. Ard Lazonder and Ruth Harmsen's meta-analysis of 72 studies found that guidance during inquiry improved students' inquiry activities, their success and what they learned.
How to start, by grade
Grades K–2
- Start with a question children can test with simple materials: "Which ball bounces highest?", "Will it sink or float?"
- Ask for predictions first, and write them on the board.
- Model how to make it a fair test (same height, same push), then let children try it with you watching.
- Record results together on a simple chart, then ask "What did we find out? How do we know?"
- Tell them the science idea clearly at the end, linking it to what they saw.
Grades 3–5
- Teach the key vocabulary and background briefly before the investigation, so students have something to reason with.
- Give the question and a partly designed method; let students decide one or two variables.
- Use a structured lab sheet: prediction, method, results table, conclusion with evidence.
- Pause partway for a check: what are you noticing, and does it match your prediction?
- End with a teacher-led discussion that makes the science idea explicit and corrects misconceptions.
Grades 6–8
- Move from structured to guided inquiry across the year: students design more of the method as they learn how.
- Teach the reasoning moves explicitly: writing a testable question, controlling variables, interpreting data, arguing from evidence.
- Use worked examples of good investigations and conclusions before students write their own.
- Ask students to explain their results to each other and to defend their conclusions with data.
- Follow each investigation with direct teaching that ties the results to the bigger idea.
Grades 9–12
- Use open inquiry for students who already have strong background knowledge and lab skills.
- Keep explicit teaching for new and difficult concepts; use inquiry to apply and extend them.
- Assess the reasoning (the argument from evidence), not only the right answer.
Examples
Sink or floatKindergarten–1st grade
A tub of water and ten objects. Children predict sink or float for each and sort them into two hoops. Then they test one at a time and move objects that surprised them. The teacher asks what the floaters have in common, then names the idea: some heavy things float and some light things sink, because it depends on more than weight.
Paper helicoptersGrades 3–5
Question: "Does the length of the wings change how long a paper helicopter takes to fall?" The teacher shows how to time a drop and why every drop must be from the same height. Groups test three wing lengths three times each, record times in a table, and write a conclusion using their data. The class then compares results across groups.
Pattern hunt in mathGrades 3–6
Students get a table of multiplication facts for the 9s and are asked: "What patterns do you notice?" After five minutes of noticing in pairs, the teacher collects patterns, asks students to test whether each holds, and then explains why the digit-sum pattern works, connecting it to place value.
Reading sources in historyGrades 5–8
Students get three short primary sources about why a town was built where it was. They answer guiding questions for each source, then argue in groups for the most likely reason, citing evidence. The teacher closes by laying out what historians think and how the sources support it.
Common mistakes
- Inquiry with no guidance.
- Handing students materials and a question and stepping back is the version that does worst in the research. Give a clear question, model the method, check in, and teach the idea explicitly at the end.
- Inquiry before students know anything.
- Reasoning about evidence needs something to reason with. Teach essential vocabulary and background first, briefly, then investigate.
- Skipping the conclusion.
- Students may finish an investigation with the wrong idea. Always end with a discussion that makes the right idea explicit and addresses misconceptions.
- Doing the activity, not the thinking.
- Furtak and colleagues found the largest effects where students did the reasoning work of science: explaining and arguing from evidence. Hands-on isn't the same as minds-on; ask for explanations.
- The same level of openness all year.
- Start structured and release more decisions to students as they gain knowledge and skills, the same way you would with any complex task.
Time and cost
Time: investigations take longer than telling. A structured inquiry lesson can fit in one period; open inquiry projects take days or weeks. Plan which ideas are worth that time.
Money: usually low: everyday materials for most elementary investigations.
Training: moderate. The skill is in designing the guidance: good questions, the right amount of structure, and a closing discussion that turns activity into understanding.
Debates and open questions
Inquiry versus explicit instruction. This is one of education's oldest arguments, and our explicit instruction card covers the other side. The meta-analyses agree on the main point: guidance matters, especially for novices. They disagree in emphasis: researchers who favor inquiry stress that good inquiry is guided, and critics stress that much classroom inquiry isn't.
What counts as inquiry? Furtak and colleagues noted that the type of teaching labeled inquiry has varied greatly across studies, and built a framework to separate what students do from how much guidance they get. Comparing studies without that distinction can produce opposite conclusions from the same body of research.
Does guidance help everyone equally? Lazonder and Harmsen found the type of guidance mattered for how well students performed during inquiry, but there were too few studies to settle whether younger and older students need different kinds. That's an open question.
Tools that do it
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- KWL chart: what we know and want to know before an investigation, and what we learned after.
- Bar graph template: a ready graph for recording and comparing investigation results.
- Countdown timer: time trials and keep investigation steps moving.
- Random group maker: form lab groups in a second.
- Cause and effect organizer: help students link what they changed to what happened.
- 30 STEM challenges by grade: investigation and design challenges to structure as guided inquiry.
Questions teachers ask
- Is inquiry-based learning the same as discovery learning?
- Not when it's done well. Discovery learning often means students find things out with little help, which does poorly in the research. Inquiry-based learning, as its advocates describe it, is structured and scaffolded by the teacher. The terms overlap in practice, which is why it's worth asking how much guidance a lesson gives.
- Does inquiry-based learning work?
- Guided inquiry, yes: a meta-analysis of 37 studies of inquiry science teaching found a positive effect, larger when the teacher led. Unguided discovery, no: a meta-analysis of 164 studies found it did worse than explicit teaching. Hence the Mixed rating.
- What's the 5E model?
- A common lesson structure for science inquiry: engage, explore, explain, elaborate, evaluate. Its explain step, where the teacher makes the idea explicit after students have explored, is the kind of guidance the research supports. We haven't added a study of the 5E model itself to this card.
- How much guidance should I give?
- More for new and difficult content and for younger or less experienced students; less as students build knowledge and skills. When in doubt, give the question and the method, and let students work out the result and explain it.
- Is inquiry good for students who are behind?
- With strong structure, it can be part of their learning, but unguided inquiry is the riskiest for students without background knowledge. Teach the key ideas explicitly and use inquiry to apply and deepen them.
Related in the Library
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Written for teachers by Peabody Teach from the sources listed above, which we read on the publisher's or clearinghouse's own page. We summarize and link; we don't copy. No ads, no affiliate links. Something wrong or out of date? Tell us.