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And here is a
link to a good example
How does the case fit together
How will you stop the battery from moving around inside
the case
How will you stop the circuit from moving around in the
case
How will you secure your LEDs, switches, speakers etc
(input/output devices)
What size will your case be
How will you join your materials
What materials will you use and why
How will you use the space effectively
How will your user interact with the product (how will
they press buttons, pick up, put down, change batteries, repair or access the
circuit etc etc)
You first need to start doing some loose but neat sketches
of your product that show how you are going to satisfy all of the above.
After you have done a few sketches (at least 3, minimum)
you can pick the one that you think is the best (don’t forget to make
notes about your design decisions and right them up in your coursework).