P07403: Garri Processing Project
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Test Results

Usability Study

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

Usability Results

Peeler

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

Usability studies indicate product acceptance. Subjects' ratings fall within specified range.

Usability studies indicate product acceptance. Subjects' ratings fall within specified range.


Grater

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

Usability studies indicate that the grater is intuitive to use but force is unacceptable.

Usability studies indicate that the grater is intuitive to use but force is unacceptable.


User Comments:

Time Trials

Average peeling time of 22.75 seconds per cassava meets peeling time specification.

Average peeling time of 22.75 seconds per cassava meets peeling time specification.

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.

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.