👋 Hey {{first name | reader!}}
In this edition of ⚗️DistillED, we're looking at visualisers — the document camera or inkable tablet that has become one of the most powerful instructional tools in the modern classroom.
In this edition
📊 Do Now: Quick Poll!
What do you primarily use a visualiser (or tablet) for?
What is a Visualiser?
A visualiser is a mounted document camera that projects whatever sits beneath it onto a screen or whiteboard in real time. It can display a student's exercise book, a teacher's written model, a diagram being constructed live, a physical object, or a piece of marked work — without scanning, photographing, or transferring anything. Unlike modelling at a whiteboard, it allows the teacher to face the class throughout. Eye contact and monitoring never stop and the classroom stays in view.
The main use cases for a visualising device in class are:
Use 1: Live modelling of writing, working, or diagrams in real time
Use 2: Whole-class feedback using student work projected to the class
Use 3: Building visual representations — diagrams, etc — as you explain
Use 4: Marking and annotating student work live, in front of the class
It's worth noting that a visualiser doesn't have to be a physical camera. A tablet — Surface or iPad — running OneNote and mirrored to the classroom screen achieves the same effect. The teacher writes and annotates in real time, students see every stroke, and the lesson can be saved or shared afterwards.
A mini-whiteboard placed under the visualiser is the ideal modelling surface. It's erasable, so the teacher can revise, cross out, and redo in real time. It requires no page turns, no wasted exercise book spreads, no awkward repositioning. The teacher writes, models, corrects, wipes, and starts again — and every moment of that process is visible to the class. The impermanence is the point because students see that thinking is revisable, not fixed.
In typical ⚗️DistillED fashion, here's what visualisers are — and what they aren't:
👎 A Visualiser IS NOT:
Document Cameras for Scanning → A visualiser displays live footage; it doesn't digitise and file documents
A Replacement for Explanations → Showing the screen changes nothing if the teacher isn't narrating their thinking aloud
Only for Displaying Finished Work → The most powerful use is showing the work in progress, not the polished product
Tech for Tech's Sake → A visualiser earns its place when it makes thinking visible; pointing it at a textbook page is not enough
👍 A Visualisers IS:
A Modelling Tool → They let teachers write, draw, and think in real time, with every step visible to the whole class
A Feedback Mechanism → Student work can be placed under a visualiser for class-wide discussion, editing, and annotation
A Cognitive Load Reducer → They eliminate the mismatch between the teacher's model and the space where students work
Cross-Subject → Every subject that involves writing, drawing, calculating, or constructing benefits from live modelling under a visualiser.
Why Do Visualisers Matter?
Barak Rosenshine’s Principles of Instruction (2012) are closely aligned with the practice of visualising work live in the classroom. The principles emphasise presenting new material in small steps, providing worked examples, and demonstrating what success looks like before students attempt independent practice. A visualiser is one of the most direct classroom applications of these ideas. It enables teachers to break processes down into manageable micro-steps — not simply telling students what to do, but showing them live, externalising expert thinking, modelling decision-making, and narrating the thought processes that sit behind successful performance.
Cognitive Load Theory explains why this matters. John Sweller's research established that working memory is limited and easily overwhelmed. When students have to simultaneously decode verbal instructions, imagine a visual layout, and recall content knowledge, cognitive load can become unmanageable. The visualiser reduces that load by making one element — the layout and process — perceptually available rather than imagined. Students can direct working memory toward the actual thinking, rather than the logistics.
"Since working memory has a limited capacity, instructional methods should avoid overloading it with activities that don't directly contribute to learning."
There is also a dual coding dimension to live modelling. When a teacher narrates aloud while modelling under a visualiser — "I'm going to write my topic sentence here, and I'm going to keep it to one sentence, not two, because…" — students receive information simultaneously through verbal and visual channels. Research on dual coding by Allan Paivio (1971) and later work by Richard E. Mayer suggests that learning becomes more durable when words and visuals are meaningfully combined:
“People learn more deeply from words and pictures than from words alone.”
A visualiser makes this process visible and routine within everyday classroom instruction. The diagram below shows the full process — from the visualiser as stimulus, through the two separate channels, to integration in working memory and transfer to long-term memory.
How Do I Use a Visualiser?
The visualiser doesn't change your lesson structure. It changes the quality of what happens inside your existing structure. Here is how the five uses map onto an explicit lesson — and what they look like in a KS3 Science lesson on cells.
If WCF reveals students aren't ready, return to I Do — model the thinking process live under the visualiser before releasing them to practise again.
In true ⚗️DistillED fashion, the table below shows how to build each use into your teaching:
Use | Explanation | Example |
|---|---|---|
Use 1: Live Modelling at the Start of a Task
| Place a mini-whiteboard under the visualiser and model the task live. The mini-whiteboard is the teacher's surface — erasable, flexible, and uncluttered. Write a response, narrate the thinking, cross something out, revise it. Don't show a finished model. Show the construction of a model in real time, including the hesitations and corrections. Then wipe it clean and do it again if needed. | "I'm going to write my topic sentence here. Actually — I want to check whether I'm making a claim or just stating a fact. Let me reread the question... Right. I'm changing this." [wipes and rewrites] |
Use 2: Live Marking During Independent Work
| While students write, circulate with a purpose: identify two or three strong responses and two or three common errors. Halfway through the task, place a strong response under the visualiser (with the student's permission, or anonymised). Talk through what makes it effective. Then place a response with a common error and model the correction live. Students annotate their own work as you go. Doug Lemov calls a version of this Show Call — picking up a student's work mid-task and projecting it without warning. The accountability effect is significant: when students know any piece of work might go under the camera, the quality of independent practice changes. | "Look at how this student has structured their opening. Notice they've used the exact language from the question. That's deliberate. Now look at this one — can you spot what's missing?” |
Use 3: Whole-Class Feedback the Lesson After
| Skim the set of books and record patterns on a WCF crib sheet: what went well, common errors, key vocabulary, a model answer. The next lesson, deliver it live under the visualiser — project a strong response, narrate what makes it work, then place a weak one and model the correction in real time. Students use a different colour to revise their own work as you go. The visualiser is the delivery mechanism. The crib sheet is the planning tool. | "Let's look at this opening together. What's working? Now look at this one — how would you improve it? Take thirty seconds, then we'll discuss." [places student work under visualiser, annotates live] |
Use 4: Live Diagramming and Dual Coding
| Use the visualiser to build diagrams, timelines, concept maps, or annotated images in real time — not on a slide prepared in advance, but drawn live on a mini-whiteboard as the explanation unfolds. The teacher narrates each stroke: why this arrow points that way, what this label means, how these two elements connect. Students receive the same information through two channels simultaneously — language and image. That's the dual coding dividend. The visualiser makes it routine across every subject. | "I'm going to draw this out as I explain it. Watch where I put the label — that position matters." [draws the diagram live, pauses mid-construction] "Before I add the next part — what do you think connects here? Watch me and then copy.” |
Use 5: Thinking Aloud the Process
| In subjects where process matters — maths working, scientific method, essay structure, design choices — use the visualiser to think through a problem in real time. Don't present a solution. Present a search. Students see that good thinking is revisable. That visibility is itself instructive. | "I'm not sure whether to use a colon or a semicolon here. Let me think about what each one does..." [pauses, writes both options, crosses one out] "Right — colon. Here's why." |
A visualiser in silence is a camera pointed at paper. A visualiser with a teacher thinking aloud is a window into expert practice.
Until next week!
— Jamie
If you want more:
👉 Read Worked Examples — showing students how to complete a task, not just what the finished product looks like
👉 Read Rosenshine's Principles of Instruction — the ten principles that form the backbone of effective explicit teaching
👉 Read Explaining With Precision — designing explanations that reduce cognitive load and build clarity from the start
👉 Get the DistillED Playbooks for practical, evidence-informed classroom practices
📥 Free One-Page Guide
The Visualiser Guide One-Pager
This edition comes with a free one-page guide on Visualisers — a practical summary of what they are, why they matter, and five ways to use them effectively. Print it, share it with your department, or use it as a planning reference before your next lesson.
⚗️DistillED+ Exclusive Content
This week, ⚗️DistillED+ members get access to the Visualisers CPD PowerPoint and Strategy Checklist — breaking down how to set up live modelling, design whole-class feedback cycles, and build visualiser use into your instructional routines so it becomes part of your practice, not a one-off.
