How to Use Dual Coding to Explain Ideas in Words and Sketches

Dual coding is the practice of explaining an idea in two connected ways: with words and with a visual representation. The visual does not need to be artistic. A useful sketch might be a simple diagram, timeline, flow chart, table, map, labeled picture, set of arrows, or before-and-after comparison. The point is not decoration. The point is to make meaning easier to understand, remember, and retrieve.

Many learners already use words when they study. They read, highlight, summarize, listen, and write notes. Dual coding adds a second route into the same idea. A short verbal explanation can name the concept, define terms, and describe relationships. A sketch can show structure, sequence, contrast, cause and effect, parts of a whole, or movement over time. When the two forms support each other, the learner has a stronger mental model than either form could provide alone.

The skill is not simply “draw a picture.” The skill is deciding what the picture should show, keeping the words brief, testing whether each representation adds meaning, and then using the sketch later as a retrieval prompt. Learners, parents, teachers, tutors, and adult self-learners can all use dual coding to turn complicated material into clearer explanations.

The concept: words and visuals should share the work

Words are good at precision. They can define a term, state a rule, explain a condition, and describe an exception. Visuals are good at relationships. They can show where parts fit, what changes first, what connects to what, what is larger or smaller, and how a process moves.

Dual coding works best when the words and the sketch do different jobs for the same idea. If the words already say everything and the drawing is only a cute picture, the sketch adds little. If the diagram is full of labels but the learner cannot explain what it means, the visual may become another thing to memorize. The goal is a partnership: the words guide interpretation, and the sketch organizes the relationships.

For example, a learner studying evaporation could write, “Evaporation happens when faster-moving liquid particles escape from the surface and become gas.” Next to that sentence, the learner could sketch a container of liquid with a few particles leaving the surface, arrows pointing upward, and a label for “surface.” The words explain the concept. The sketch shows why surface particles matter and how the change happens.

Start with the idea, not the drawing

The first step is to decide what the learner needs to understand. A sketch should answer a learning question. Without a question, learners often make drawings that look busy but do not help recall.

Before sketching, ask one of these questions:

What are the main parts of this idea?
What happens first, next, and last?
What causes what?
What is being compared?
Where does this fit inside a larger system?
What changes over time?
What mistake do learners often make about this topic?

The answer to the question determines the visual form. A process may need a flow chart. A set of parts may need a labeled diagram. A comparison may need a two-column table or Venn diagram. A cause-and-effect chain may need arrows. A timeline may need stages. A concept with examples and non-examples may need a divided chart.

This prevents the common mistake of choosing a picture first and forcing the content into it. The thinking should come before the format.

Choose a sketch type that matches the meaning

Different ideas need different visuals. Learners do not need many drawing skills, but they do need a small menu of useful structures.

Labeled diagram: use for parts of a system, object, body, machine, sentence, graph, or concept.
Flow chart: use for procedures, cycles, decision steps, problem-solving methods, and cause chains.
Timeline: use for historical events, development, story structure, project phases, or scientific sequences.
Comparison chart: use for similar concepts, confusing terms, methods, characters, theories, or categories.
Concept map: use for relationships among several ideas, especially when one topic connects to many others.
Before-and-after sketch: use for change, transformation, revision, experiment results, or feedback loops.
Example and non-example chart: use when learners must recognize what belongs in a category and what does not.

The sketch should be simple enough to redraw from memory. If a learner spends most of the time shading, coloring, or arranging a page beautifully, the activity may feel productive without improving understanding. A useful dual-coding sketch is usually quick, plain, and easy to explain aloud.

Use brief words beside the sketch

Dual coding does not mean writing a full paragraph and then adding a full-page drawing. The most useful format is often a small sketch with short labels, arrows, and one or two explanatory sentences.

Use words for:

the name of the concept;
key terms that must be remembered accurately;
conditions, rules, or exceptions;
a short explanation of what the arrows or sections mean;
a warning about a common misconception.

For instance, a learner studying supply and demand might draw two crossing curves and label the point where they meet as “equilibrium.” The words beside it might say, “Equilibrium is the price where quantity supplied equals quantity demanded.” The diagram shows the relationship. The sentence states the precise meaning. Together they do more than either one alone.

A strong rule is: if the learner cannot explain the sketch in one minute, the words are probably too vague or the diagram is trying to show too much.

Test whether each representation adds meaning

Not every visual improves learning. Some visuals distract, repeat, or confuse. Before treating a dual-coded note as useful, test both sides.

Ask these questions about the sketch:

Does the sketch show a relationship that is hard to see in words alone?
Can I explain every arrow, label, section, or symbol?
Does the sketch remove clutter rather than add it?
Would I know what to redraw if I covered the original?
Does it show the most important idea, not just a decorative scene?

Ask these questions about the words:

Do the words define the concept accurately?
Do they explain what the sketch means?
Do they include the key terms I must use correctly?
Do they prevent a likely misunderstanding?
Are they short enough to support the visual instead of replacing it?

If the sketch and words say exactly the same thing, revise one of them. If the sketch is confusing without a long explanation, simplify it. If the words are understandable but the visual adds nothing, choose a different visual form or skip the drawing. Dual coding is a learning tool, not a requirement for every note.

The five-step dual-coding routine

Use this routine after reading a section, watching a lesson, hearing an explanation, solving a worked example, or reviewing feedback.

Name the idea: write the concept, process, rule, event, or skill at the top.
Choose the relationship: decide whether the idea is about parts, sequence, cause, comparison, change, or category membership.
Sketch the structure: draw the simplest diagram that shows that relationship.
Add brief words: label the key parts and write one or two precise explanatory sentences.
Retrieve from the sketch: cover the notes later, redraw the sketch, and explain it aloud or in writing.

The final step matters. Many learners stop after creating the note. But the note is only preparation. Learning strengthens when the learner later uses the sketch as a prompt and tries to reconstruct the idea from memory.

Use sketches as retrieval prompts

A dual-coded sketch becomes most powerful when it supports retrieval practice. Retrieval practice means trying to bring information back from memory rather than simply rereading it. A sketch can serve as a cue that helps the learner rebuild the explanation.

There are several ways to do this:

Blank redraw: close the notes and redraw the diagram from memory.
Label removal: copy the sketch without labels and fill them in later.
Arrow explanation: point to each arrow and explain what relationship it represents.
Sketch-to-speech: use the diagram to give a one-minute explanation without reading notes.
Words-to-sketch: read only the verbal definition and recreate the visual structure.
Sketch-to-questions: turn each part of the diagram into a practice question.

For example, a learner studying the water cycle might redraw the cycle from memory, label evaporation, condensation, precipitation, and collection, then explain how energy and temperature changes are involved. The diagram prompts the structure, but the learner still has to retrieve the meaning.

A complete example: explaining a difficult concept

Imagine a student is learning cognitive load. A paragraph-only note might say, “Cognitive load is the amount of mental effort used in working memory. Learning is harder when too much information must be processed at once.”

That is accurate, but a sketch can add structure. The student draws a small box labeled “working memory” with only a few spaces inside. Several arrows point toward the box: new terms, instructions, examples, distractions, and problem steps. One arrow points out toward “understanding.” Beside the sketch, the student writes, “Working memory is limited. Good instruction reduces unnecessary load so more effort can go toward the main idea.”

Now the learner can explain the concept more clearly. The box shows limitation. The incoming arrows show competing demands. The outgoing arrow shows the goal. The words explain the educational meaning. Later, the learner can redraw the box and arrows from memory and use them to explain why a cluttered worksheet, unclear directions, or too many new terms at once can make learning harder.

Routines for learners

Learners can use dual coding during study without turning every page into an art project. The best routine is short and selective.

After studying a section, choose one idea that feels important or confusing.
Ask, “What relationship is hidden in this idea?”
Pick a visual form: diagram, flow chart, timeline, comparison chart, or concept map.
Create a rough sketch in two to five minutes.
Add labels and one short explanation.
Close the source and explain the sketch from memory.
Return the next day and redraw it without looking.

This routine works especially well for science systems, history sequences, math procedures, grammar patterns, literature themes, essay structures, and exam review. The learner should not dual-code everything. Choose the ideas where relationships matter.

Routines for parents and caregivers

Parents can help children use dual coding without needing to be subject experts. The parent can ask questions that help the child connect words and sketches.

A simple home routine is:

Ask the child to explain the idea in one sentence.
Ask, “Could this be shown as parts, steps, a comparison, or a cause chain?”
Have the child draw a quick sketch on scrap paper.
Ask the child to point to each part and explain what it means.
Cover the textbook and ask the child to redraw or relabel the sketch later.

For younger children, keep the choices small. Say, “Is this more like a sequence or a comparison?” If the child gets stuck, offer a starter shape such as three boxes for steps, two columns for comparison, or a circle with labels for parts.

Parents should praise clarity, not artistic quality. A messy diagram that helps the child explain the idea is better than a beautiful drawing that hides the thinking.

Routines for teachers

Teachers can use dual coding to make explanations more visible. The key is to model the connection between the spoken explanation and the visual structure.

A classroom routine can look like this:

Introduce the concept in one or two clear sentences.
Draw the visual slowly while explaining why each part belongs.
Pause before adding an arrow or label and ask students what relationship it should show.
Ask students to write one sentence that explains the completed visual.
Remove or cover the model and have students redraw the structure from memory.
Use a new example and ask students to adapt the same visual form.

This keeps students from copying diagrams passively. They must connect the visual to meaning. Teachers can also collect a few student sketches to see whether students understand the relationship or only remember the shape.

Routines for tutors

Tutors can use dual coding as a diagnostic tool. A learner’s sketch often reveals where the understanding breaks down.

During a tutoring session, ask the learner to sketch the idea before giving a long explanation. If the sketch has missing arrows, reversed sequence, vague labels, or too many unrelated details, the tutor has useful evidence. The next explanation can target the exact misunderstanding.

A tutoring routine can be:

Ask the learner to explain the topic in words for thirty seconds.
Ask them to sketch the relationship they described.
Compare the words and the sketch: what appears in one but not the other?
Revise the sketch together, keeping only the parts that add meaning.
Have the learner close the notes and explain the revised sketch independently.
Begin the next session by asking for a quick redraw.

This routine helps tutors avoid over-explaining. The learner’s sketch shows what kind of support is needed: missing vocabulary, wrong sequence, weak cause-and-effect reasoning, or unclear category boundaries.

Routines for adult self-learners

Adult learners often study dense material: professional certifications, software workflows, language structures, medical terminology, legal concepts, finance models, management frameworks, or technical manuals. Dual coding can make that material easier to organize and review.

An adult self-learning routine can be:

After a study block, choose the one concept most likely to matter in real use.
Create a small diagram that shows how the concept works, not just what it is called.
Add the minimum words needed for accuracy.
Use the sketch to explain the concept as if training a colleague.
Place the sketch in a review folder and redraw it after one day, one week, and before a real task or assessment.

For workplace learning, the sketch should connect to action. A flow chart might show how to handle a customer request. A decision tree might show when to escalate an issue. A comparison chart might separate two similar policy rules. The test is whether the learner can use the sketch to make a better decision later.

Common mistakes and fixes

One common mistake is making the visual too pretty. If the learner is spending more effort decorating than explaining, set a time limit. Use a pencil, plain boxes, stick figures, arrows, and labels. Beauty is optional. Clarity is not.

Another mistake is copying a diagram without understanding it. To fix this, cover the diagram and ask the learner to explain why each part is there. If they cannot explain it, the diagram needs active study, not more copying.

A third mistake is using a picture when a relationship is needed. A drawing of a plant may not explain photosynthesis. A labeled process diagram with arrows showing light, carbon dioxide, water, glucose, and oxygen is more useful because it shows how the parts relate.

A fourth mistake is adding too many ideas to one sketch. If the page becomes crowded, split it into two visuals. One sketch might show the overall system. Another might show one step in detail.

A final mistake is never returning to the sketch. Dual coding supports learning when it becomes part of retrieval practice. Schedule a redraw, relabel, or explain-from-memory session. Otherwise the sketch may remain a nice note instead of becoming a memory tool.

A quick checklist before using a dual-coded note

Before finishing, check the note with these questions:

Can I state the main idea in one sentence?
Does the sketch show parts, sequence, cause, comparison, change, or category membership?
Does every label or arrow have a purpose?
Do the words add accuracy that the sketch cannot show alone?
Could I redraw the sketch from memory tomorrow?
Could I use the sketch to answer a practice question?

If the answer to these questions is yes, the dual-coded note is likely useful. If not, revise it until the relationship is clearer.

The takeaway

Dual coding helps learners explain ideas by connecting brief verbal explanations with simple sketches. Words give precision. Visuals show relationships. Together they can reduce confusion, support memory, and make review more active.

The strongest dual-coding routine is simple: choose the idea, identify the relationship, sketch the structure, add brief words, test whether both forms add meaning, and later retrieve the idea from the sketch. A learner does not need to draw well. They need to make thinking visible enough to explain, remember, and use.

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