
Design and Applied Technology (Secondary 4-6)
14
A design sketch
(a) Verbal Description
It is cheap and useful, especially when the operations and use of a product are presented.
However, this method is not comprehensive.
(b) Flowcharts
Flowcharts are good for presenting the operations of a product. However, some people may
not understand the standard flowcharts.
(c) Realistic Illustrations on Paper or Screen
Computer-aided Design (CAD) software can show three dimensional coloured pictures, and
also create details, such as material textures, light effects, shadows and mirroring on glass
surfaces visible to audience.
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