Add - Subtract - Change
The add-subtract-change technique is easy to use. It is particularly
good for use in redesigning things, but can be used for any type
of problem. You just start with the existing "solution"
and ask what you can add, subtract or change. I'm going to use
a bicycle for an example.
Using the “add-subtract-change” technique to come
up with our new product, we would look at an existing bicycle
and ask:
1. What could we add?
Maybe a radio could be built into the handle bars? Perhaps
a map holder that attaches to the handle bars? A pet-carrier
up front, so you can bring your cat along for the ride? (Okay,
I'll stop looking at the handle bars as I write this.) A built-in
retractable lock?
2. What could we subtract?
Take away some of the gears? I've always thought that for
casual users, six speeds is enough. Subtract some of the weight?
Lighter is better. Lower the price?
3. What could we change?
We could make the tires reflective for safety. We could put
a hole in the seat for men's comfort, or find a new type of padding.
Could we make the gears shift automatically?
Add : As you can see, looking for things to add can
require a bit of imagination.
Subtract : On the other hand, looking for things to
subtract can be very systematic. Just look at everything, item
by item, and ask what would happen if it was removed or lessened.
Change : The last question - What could we change?
- is where you get to be very systematic and imaginative. Item
by item you look at every aspect of the existing solution to
imagine ways in which you could alter it, replace it, or redesign
it.
To quickly generate new ideas, why not try the problem solving
technique; add-subtract-change.
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