Why name the levels of inquiry
Teachers sometimes feel they must choose between telling students what to do and letting them work it out alone. In practice there is a range between the two. A simple way to see it is to ask who decides three things: the question, the method and the answer. The more students decide, the more open the inquiry.
Naming the levels helps in planning and in conversation. A department can agree which level a unit will use. A teacher can explain to students why this week's task is more guided than last week's. The three levels here are structured, guided and open. They are points on a scale, and a class can move along it over time.
Structured inquiry: the teacher sets question and method
In structured inquiry the teacher provides the question and the method, and students collect and interpret the results. The task is clear, materials are prepared and the risk of confusion is low. It suits beginners, short sessions and topics where students need to practise a specific technique.
The limit is that students make few decisions. They may follow steps without understanding why the steps are there. To get more value from this level, ask students to explain the purpose of each step, predict the result before they run it and say what could have gone wrong. Those prompts add thinking without changing the task.
Guided inquiry: the teacher sets the question, students choose how
In guided inquiry the teacher provides the question, and students design the method within limits. A variable map or a planning sheet can support this. Students make real decisions about what to measure and what to hold steady, and the teacher checks the plans before they begin.
This level takes more time and more teacher attention. Plans need review, and different groups will need different help. It tends to produce the strongest learning about fair testing and evidence, since students feel the consequences of their choices. It works well once students have practised the basic techniques in structured tasks.
Open inquiry: students set question and method
In open inquiry, students choose the question as well as the method. They decide what to investigate, how to do it and how to present what they found. This is the most demanding level for both students and teachers, and it needs time, access to materials and agreed boundaries.
Open inquiry suits experienced groups and longer projects. It can be risky for beginners, who may choose questions that are too large or impossible to test. Support it with a question-narrowing step, a check-in at fixed points and clear criteria for what a finished investigation looks like. The teacher's role shifts from instructing to questioning.
A one-page comparison for planning
Draw a table with the three levels as columns and rows for who sets the question, who sets the method, how much teacher time it needs and what students practise. Fill it in for your own class and context. A table you wrote yourself will be more useful than any generic one.
Then mark where your next unit falls and why. A class new to investigation might start structured and move to guided within a term. A class with strong habits might try open inquiry for one short project. Write the choice and the reason at the top of the unit plan so colleagues can see the thinking.
Moving students along the scale
Change one decision at a time. In one unit, hand students the choice of what to measure but keep the question. In the next, let them adapt the question within a theme. Each step gives them one more decision to practise and gives the teacher a chance to see where support is needed.
Keep a short record of what each class managed independently. Notes such as designed a fair test with one variable or needed help choosing a measurement show progress without turning inquiry into a grading exercise. Share the notes with students so they see their own growth and can set a next step.
One topic at three levels
Take a topic such as how the temperature of water affects how fast a sugar cube dissolves. At the structured level, the teacher gives the question, the temperatures to test and the steps to follow, and students record and interpret the times. The aim is to practise careful measuring and reading a simple result.
At the guided level, the teacher gives the question and students decide the temperatures, the amount of water and how to time the result, using a variable map. At the open level, students notice something about dissolving that interests them, such as stirring or sugar type, and write their own question. The same topic supports all three levels, with different amounts of choice.
Assessing students fairly at each level
The level of inquiry should shape what you assess. In structured inquiry, it is reasonable to assess accuracy of measurement and clarity of recording. In guided inquiry, add the quality of the plan and the fairness of the test. In open inquiry, include how well the question was narrowed and how honestly the limits were stated.
Share the criteria with students before they begin, in plain language. When students know that a fair test and an honest limit count, they pay attention to them. Avoid grading the surprise of the result. A well-run investigation that gives a dull answer deserves the same credit as one that gives an exciting one.
Common mistakes and quick fixes
A frequent mistake is calling a structured task open because students enjoy it. Another is jumping to open inquiry before students can plan a fair test, which leads to frustration. A third is leaving the teacher's role unclear, so students are not sure whether to ask for help.
The fix is to be honest about the level, to say it out loud to students and to match the support to it. A structured task with good prompts can teach more than an open task with no scaffolding. The goal is not to reach open inquiry quickly but to give students the right amount of choice at each stage.