The X-Ray Protocol: 5 Routines That Make Student Thinking Visible Before November Break

Author: Annalies Corbin, Ph.D., PAST Foundation, Columbus, Ohio, USA.

In this Thursday's companion to “Seeing the Invisible: Why the Best Learning Starts Where You Can’t Look,” we move from the big idea to classroom practice.

In 1895, Wilhelm Röntgen noticed something unexpected while experimenting with cathode-ray tubes: a screen across the room was glowing even though the visible light was blocked. His discovery of X-rays gave scientists a new way to see what had previously remained hidden.

What if we approached student thinking in the same way?

A correct answer may tell us what a student knows. It rarely tells us how they arrived there, what misconception they are carrying, or what question they are ready to ask next. The five routines below are designed to make those invisible layers visible: quickly, consistently, and without turning every lesson into a formal assessment.

The goal is not to “catch” students making mistakes. The goal is to illuminate learning while there is still time to respond.

Tuesday’s Big Idea: Learning Starts Where We Cannot Look

The strongest learning environments do not simply measure finished products. They make the process of thinking available for examination, revision, and growth.

Ritchhart, Church, and Morrison (2011) describe thinking routines as short, repeatable structures that help learners explain, question, connect, and reflect. Black and Wiliam (1998) similarly emphasize that formative assessment becomes powerful when teachers elicit evidence of learning, interpret it, and use it to adjust instruction.

Together, these ideas give us a practical sequence:

1. Elicit the thinking.

2. Document the thinking.

3. Interpret the thinking.

4. Respond to the thinking.

5. Return the thinking to students so they can revise it.

That is the X-ray protocol.

The teacher is not waiting until a test to discover what students understand. Students don't wait until a grade to discover whether their reasoning is sound. Instead, the classroom becomes a collaborative ecosystem where students surface evidence early and use it to move learning forward.

The Five-Routine Implementation Plan

You can run this protocol across five class periods, or adapt the routines across a longer science, STEM, or project-based learning experience.

The content anchor might be X-rays, energy, waves, light, or technology applications. The routines can also be used in social studies, mathematics, literacy, and design challenges.

Routine 1: The First Scan

Purpose: Surface prior knowledge and initial explanations.

Begin with a phenomenon that invites interpretation but does not immediately reveal the answer. For example:

• An X-ray image of a hand

• A visible-light photograph beside an X-ray image

• A radiograph of a suitcase or object

• A diagram showing different parts of the electromagnetic spectrum

• A question such as, “How can a machine create an image of something it cannot visibly see?”

Ask students to respond individually before discussion:

• What do you notice?

• What do you think is happening?

• What makes you say that?

• What are you wondering?

Document student language as much as possible. Avoid translating responses into scientific terminology too quickly. “The bones stop something” may be more instructionally useful than a polished statement about absorption.

Elementary example: Students compare a photograph of a hand with an X-ray image and draw what they think is happening inside the machine.

Middle school example: Students place radio waves, visible light, ultraviolet waves, and X-rays in a preliminary order based on energy or wavelength, then explain their reasoning.

High school example: Students construct an initial model connecting frequency, wavelength, energy, and the ability of electromagnetic radiation to interact with matter.

PAST pillar connection: This routine activates Student Agency by treating students’ initial ideas as valuable evidence rather than errors to erase.

Routine 2: Talk Through the Invisible

Purpose: Make reasoning visible through structured conversation.

Place students in pairs or triads. Give each student a role:

• Speaker: Explains an idea or model

• Listener: Paraphrases before responding

• Evidence monitor: Names the evidence being used

Provide this sentence frame:

> “My current explanation is ______ because ______. The evidence I am using is ______. One part I am still unsure about is ______.”

The listener responds:

> “What I hear you saying is ______. I agree or disagree because ______.”

The evidence monitor asks:

> “Where did that evidence come from?”

This is not a debate routine. Students are not trying to win. They are practicing the core scientific and human skill of making reasoning available to others.

Elementary example: Students explain why a doctor might use an X-ray instead of a regular photograph to look at a broken bone.

Middle school example: Students discuss whether X-rays should be described as “light,” using evidence from a model of the electromagnetic spectrum.

High school example: Students defend a claim about why X-rays can pass through some materials more readily than others, while distinguishing energy from intensity.

Listen for language that reveals misconceptions:

• “X-rays are made of tiny particles that see through things.”

• “Higher frequency always means the wave travels faster.”

• “Bones are visible because they create the X-ray.”

• “More radiation is better because it makes a clearer image.”

These statements are not interruptions to learning. They are the learning.

PAST pillar connection: This routine strengthens Culturally Relevant Teaching and Learning by giving space to students’ experiences with medical care, family knowledge, community health, and different ways of explaining the world.

Routine 3: The Misconception Hunt

Purpose: Use incorrect or incomplete explanations as objects of investigation.

Prepare three or four statements connected to the lesson. Include accurate, inaccurate, and partially accurate ideas. Students analyze each statement using this protocol:

Students should not simply label statements “right” or “wrong.” Ask them to improve each explanation.

Elementary example: “A shadow shows what an object looks like inside.” Students test the statement using opaque and transparent materials.

Middle school example: “All waves carry the same amount of energy.” Students revise the statement using wavelength and frequency.

High school example: “A clearer X-ray image always requires more radiation.” Students investigate the relationship among exposure, image quality, safety, and detector technology.

This routine is especially useful before November break because it helps teachers identify which ideas need another experience, model, or explanation before the next unit begins.

PAST pillar connection: This routine supports Mastery-Based Learning. Students are not finished when they identify a misconception; they are finished when they can revise the explanation and support the revision with evidence.

Routine 4: The Evidence-of-Thinking Log

Purpose: Help students document how their ideas change over time.

Give each student a recurring log. The format below can be copied directly into a notebook, learning platform, or handout.

Evidence-of-Thinking Log

Phenomenon or question:

My first idea:

Evidence I noticed:

My current explanation:

What changed in my thinking?

What caused the change?
☐ New evidence
☐ A classmate’s explanation
☐ A model or demonstration
☐ Teacher feedback
☐ Further research
☐ I noticed a contradiction

What I still need to figure out:

Confidence level:
1 2 3 4 5

My next step:

Ask students to complete one section at the beginning of the week and return to the log after each investigation or discussion.

Elementary example: Students draw their first model of how an X-ray image is made, then add labels and a written explanation after a demonstration.

Middle school example: Students record how their understanding of wavelength and energy changes as they build and revise a spectrum model.

High school example: Students document how evidence from medical imaging, airport security, and industrial inspection informs their explanation of X-ray technology.

PAST pillar connection: This routine supports Student Agency and Mastery-Based Learning by making growth visible to the learner, not just to the teacher.

Routine 5: Design the Next Scan

Purpose: Turn visible thinking into a question, test, or improved solution.

Once students have surfaced their ideas and examined evidence, invite them to design a way to learn more.

Use the following prompts:

• What remains invisible or uncertain?

• What could we observe, measure, model, or compare?

• What constraints should we consider?

• Who might use this information?

• How could we make the explanation more accessible to someone else?

Students might design:

• A safe classroom model demonstrating how materials absorb or transmit energy

• A public-service explanation about medical X-rays and safety

• A comparison chart of imaging technologies

• A detector or shielding prototype using classroom materials

• An infographic for younger students explaining waves and light

This is where design thinking enters the protocol: empathize with a real audience, define the problem, generate ideas, prototype, test, and revise.

Elementary example: Students create a model or poster explaining why a doctor may need an X-ray after an injury.

Middle school example: Students design a museum exhibit that explains the electromagnetic spectrum through interactive examples.

High school example: Students propose an improved patient-information tool that explains the benefits and risks of diagnostic imaging without creating unnecessary fear.

PAST pillar connection: This routine activates Transdisciplinary Learning and Problem-Based Learning. Students draw from science, mathematics, literacy, visual communication, ethics, and technology to address a meaningful problem.

A One-Week Classroom Sequence

Here is one way to organize the five routines:

• Monday: The First Scan

• Tuesday: Talk Through the Invisible

• Wednesday: Misconception Hunt

• Thursday: Evidence-of-Thinking Log

• Friday: Design the Next Scan

The sequence can be compressed into one lesson or expanded across a two-week inquiry. The essential feature is not the calendar. It is the return to student thinking.

Each routine should produce an instructional decision. For example:

• Students need a model of wavelength and frequency.

• Students are using “energy” and “intensity” interchangeably.

• Students can state a claim but need support selecting evidence.

• Students understand the science but need help communicating it to a public audience.

• Students are ready to apply their understanding to a new technology.

Visible thinking only becomes formative assessment when it changes what happens next (Black & Wiliam, 2009).

Lesson Adaptation Prompt

Choose an upcoming lesson and complete these questions:

1. What thinking do I most need to see?

2. Which routine will reveal it most clearly?

3. What misconception or partial understanding might surface?

4. How will I document student responses?

5. What will I do if the evidence shows that students are not ready to proceed?

6. How will students revisit and revise their own thinking?

7. Which PAST pillar will be most intentionally activated?

8. What authentic audience or problem could give the learning purpose?

A strong adaptation does not require replacing the lesson. Often, it means inserting one carefully chosen routine before, during, or after the existing activity.

Before and After: From Hidden Assessment to Visible Learning

Before:
The teacher presents the electromagnetic spectrum, students copy notes, and they complete a worksheet identifying X-rays as high-energy waves. Most students finish successfully. The teacher assumes they understand the relationship among wavelength, frequency, energy, and technology.

After:
Students begin with an X-ray image and create an initial explanation. They discuss their reasoning using evidence. The teacher identifies that several students believe X-rays move faster than visible light because they have more energy. Students investigate the misconception, revise their models, and document the change in their Evidence-of-Thinking Logs. Finally, teams design a short explanation for a real audience.

The second version gives the teacher more information and gives students more ownership. It also creates more opportunities for confidence, precision, agency, and productive revision.

Copy-and-Use Checklist

Before the lesson

• Select a phenomenon, image, question, or model.

• Identify the thinking you need to see.

• Choose one routine.

• Prepare a way to document responses.

• Anticipate one likely misconception.

• Decide what instructional move will follow each possible response.

During the lesson

• Give students private think time.

• Invite multiple explanations.

• Record student language without premature correction.

• Ask, “What makes you say that?”

• Look for evidence, not just answers.

• Make uncertainty acceptable.

• Provide time for revision.

After the lesson

• Sort responses into patterns.

• Identify one idea to affirm.

• Identify one idea to clarify.

• Plan the next instructional move.

• Return evidence to students.

• Ask students what changed in their thinking.

• Save one artifact for future planning.

The Larger Invitation

Röntgen’s discovery began with a phenomenon he could not yet explain. The glow on the screen was not a problem to dismiss; it was an invitation to look more carefully.

Our classrooms are full of similar invitations.

A hesitant response. A surprising drawing. A confident misconception. A question that arrives before the lesson is ready for it. These are not distractions from learning. They are evidence of learning in motion.

Before November break, choose one upcoming lesson and make one invisible layer visible. Listen for the reasoning beneath the answer. Document the change. Use what you discover to redesign the next step.

That is how we move from checking whether students learned to helping them see themselves as learners who can investigate, revise, and transform their understanding.

References

Black, P., & Wiliam, D. (1998). Assessment and classroom learning. Assessment in Education: Principles, Policy & Practice, 5(1), 7–74.

Black, P., & Wiliam, D. (2009). Developing the theory of formative assessment. Educational Assessment, Evaluation and Accountability, 21, 5–31.

National Research Council. (2012). A framework for K–12 science education: Practices, crosscutting concepts, and core ideas. National Academies Press.

Ritchhart, R., Church, M., & Morrison, K. (2011). Making thinking visible: How to promote engagement, understanding, and independence for all learners. Jossey-Bass.

Hattie, J., & Timperley, H. (2007). The power of feedback. Review of Educational Research, 77(1), 81–112.