Does not detract from normal mobility device function
Rigid
Strong
Lightweight
Adjustable
Simple mechanism
Few components
No sharp edges or pinch points
Fail-safe mechanism
Readily available or easy to manufacture components
Corrosion resistant
User importance rank
Provide walking stability
x
x
x
x
1
Take weight off legs
x
x
x
x
4
Not heavy
x
x
7
Fits the user/ergonomic
x
x
3
Easy to adjust
x
x
x
5
Quick to use
x
x
6
Intuitive to use
x
x
x
11
Safe
x
x
x
x
x
x
x
2
Affordable
x
x
x
x
10
Durable
x
x
x
x
x
8
Easy to make
x
x
12
Weather-proof
x
x
9
This table is a quality function deployment (QFD) diagram which has general crutch requirements on the left and design specifications along the top. The far right column has the user importance rank, where 1 is the highest priority.