Communicating and Recording Design Ideas
A good drawing explains an idea faster than words. Learn the techniques a designer uses, from a quick freehand sketch to an accurate CAD model, and how annotations justify every choice.
Justify the choices, the way you are assessed
Free interactive practice on the decisions the assessment actually asks you to justify.
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A picture speaks
A clear drawing can explain a design idea faster than a page of words. Designers use many techniques, from a quick sketch to a computer model, to show and justify their ideas.
Ways to draw
Designers pick the right technique for the job:
Sketch or CAD?
Early ideas and final drawings need different tools.
Which view?
Which drawing shows how the separate parts of a product fit together?
- An exploded view
- A perspective drawing
- A quick freehand sketch
- A single plan view
Match the technique
- Isometric drawing
- Orthographic drawing
- Exploded view
- CAD
- A 3D view with sloped lines that keep their scale
- Flat front, side and plan views with exact sizes
- Parts pulled apart to show how they assemble
- A design drawn and edited on a computer
Annotate to explain
An annotated sketch is a drawing covered in labels. Each label explains a decision: what material to use, how big a part is, or how it meets the user needs. In an exam, "use annotated sketches to show" means draw and label, not write a paragraph.
Ways to communicate
Which THREE are ways to communicate a design idea?
- A freehand sketch
- A 3D model
- A CAD drawing
- Eating lunch
- Checking the weather
From idea to drawing
Put the steps of communicating a design idea in a sensible order.
- Sketch the first idea freehand
- Add annotations to explain it
- Develop it with orthographic and exploded views
- Produce an accurate CAD model
- Present the final drawing
Complete the idea
A quick _____ sketch captures a first idea. Adding labels makes it an _____ sketch, which explains and justifies each choice. To give exact sizes for manufacture, a designer draws an _____ view. On a computer, _____ lets them edit the design and make a 3D model. An _____ view shows how the parts fit together.
True or not?
Tap the TWO statements that are true about communicating design ideas.
- An annotated sketch uses labels to justify design choices.
- An orthographic drawing gives exact sizes for manufacture.
- A freehand sketch is the most accurate way to give sizes.
- CAD drawings cannot be edited once they are made.
- An exploded view hides how the parts fit together.
The right method
- Show every side with exact sizes
- Show how the parts come apart
- Show a lifelike 3D image
- Edit the design and make a 3D model
- An orthographic drawing
- An exploded view
- A perspective drawing
- CAD
Pick the method
Choose the best method for each task.
- A designer wants to jot down their first ideas quickly. Which method fits best?
- The workshop needs a drawing with exact sizes to make the product. Which method fits best?
- A designer wants to explain on the drawing why they chose a material. Which method fits best?
Draw it properly
Put the steps of making a 3rd-angle orthographic drawing in the right order.
- Choose and draw the front view
- Add the side and plan views
- Line them up in the correct 3rd-angle positions
- Add the exact dimensions
- Label the drawing clearly
Explain the methods
Explain how a designer communicates and justifies their design ideas.
- Describe two ways to communicate a design idea
- Explain what an annotated sketch adds
- Explain when an orthographic drawing is useful
- Explain one benefit of using CAD