20 volunteer subjects were each given a piece of a yam and were then asked to peel and grate it using the prototype. Minimal intruction was given unless asked for by the user. After completion of peeling and grating, the users were given a brief survey to collect data on their opinion of the devices.
See: Usability Survey
95% of users could figure out how to use the peeler without instruction
100% of users are comfortable with the amount of force required to operate the peeler and could peel 50 yams using this device
90% of users prefer the peeler over a standard kitchen knife for peeling yams 5% of users prefer a standard kitchen 5% of users had either never peeling anything with a knife or were undecided on which they would choose
100% of users could figure out how to use the grater without instruction
65% of users are comfortable with the amount of force required to operate the grater and could grate 50 yams using this device
50% of users prefer the cassava for grating yams 30% of users prefer a cheese grater for grating yams 20% of users had either never grated anything with a cheese grater or were undecided on which they would choose
- Force required for the grater could be tiring, not sure if 50 cassavas is feasible using this without taking multiple breaks. However in my country, this would be a vast improvement over the current method of peeling and grating by hand. Peeler A+. Grater B- but with improvement would be beneficial.
- Very good. Need to lighten force on grater a bit but it is usable. Somewhat difficult to place onto peeler.
- Improve anchoring system (grater)
- Cassava grater needs tighter tolerances, less wobbly
- Grater brings blade away from hand, less risk of getting hurt
- Good Peeler
Average grating time of 125.1 seconds per cassava indicates further work is required. Time must be reduced to a maximum value of 60 seconds per cassava.