Measuring and fitting — Design, 7–10 years
Good designs fit the people, spaces and parts they are meant for. Measuring turns a guess into information you can use.
Measure before you make
Measurement tells you how long, wide, high or heavy something is. In design, it helps parts fit, leaves enough room to use an object and prevents waste. A drawing can look right but still fail if its sizes do not match the real object or person.
Why designers measure
The problem is that our eyes are good at judging some shapes but poor at judging exact size. A box that seems large enough may not hold the books, or a handle that looks fine may not fit a hand. Designers measure because real objects must work in real spaces, with real people and parts.
Sizing a pencil holder
You design a holder for pencils that are 18 centimetres long. First, measure the pencils and add 2 centimetres so they are easy to take out: the holder must be at least 20 centimetres high. Next, measure its base and allow room for five pencils. If each pencil needs 2 centimetres, make the inside at least 10 centimetres wide.
Forgetting room to use it
A common mistake is making a part exactly the same size as the thing that must go inside it. That seems sensible because an exact match sounds neat, but real materials have thickness and people need space to move. Leave a small gap where fitting or movement is needed, then check that the object is not loose.
Fitting the real world
Buildings, clothes, furniture and phone cases all depend on measurements. A door must be wide enough for people, a shoe must fit a foot and a case must match a phone’s buttons. Designers measure both the object and the space around it so the result works beyond the drawing.
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