Words and pictures

Dual Coding

Combine words and visuals to make knowledge stick

What the Research Says

Dual coding theory states that information processed through both verbal and visual channels is stored in two separate memory networks, making it significantly easier to recall. For Design & Technology, this is especially powerful because the subject naturally combines text, diagrams, and physical processes.

Evidence Base

Study	Finding	Impact
Paivio (1986)	Information encoded both verbally and visually is recalled up to twice as effectively	High
Mayer (2009)	Multimedia learning principles show combining images with words outperforms either alone	High
Clark & Paivio (1991)	Dual coding is especially effective for concrete, visual subjects like engineering and design	High

Step-by-Step Method

1
Draw process flowcharts — For each manufacturing process (injection moulding, vacuum forming, etc.), draw a simple flowchart showing each step with arrows and labels.
2
Create material comparison tables — Draw a grid comparing properties (hardness, tensile strength, cost) across different materials in the same category.
3
Annotate product sketches — Draw a simple product and label every design decision: material choice, manufacturing method, surface finish, sustainability features.
4
Use colour coding — Assign colours to categories: red for forces/stresses, green for sustainability, blue for materials, orange for processes.

Example 1: Mechanical Devices Diagram

Draw simple diagrams of first, second, and third class levers. Label the fulcrum, effort, and load on each. Add arrows showing the direction of force. This single diagram covers an entire topic.

Example 2: Energy Sources Mind Map

Create a mind map with “Energy” in the centre. Branch into renewable and non-renewable. For each source, draw a tiny icon (sun, wind turbine, oil barrel) and note one advantage and one disadvantage.

Common Pitfalls

Making it too pretty — The goal is learning, not art. Simple sketches with clear labels work better than elaborate drawings.
Copying diagrams without understanding — Draw from memory first, then check. Copying teaches you nothing.

When to Use This

Use dual coding throughout your revision, especially for topics with physical processes, mechanisms, or material comparisons. Spend 15–20 minutes creating one visual summary per topic. Review your diagrams before the exam — the visual memory will help you recall details quickly.