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Toaster (Usability (User error protection (If there is no bread in the…
Toaster
Usability
User error protection
If there is no bread in the toaster, the heater will not heat up.
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Accessibility
The toaster can be managed via switcher button and the heater roter and perform all its (according to the user's manual) functions.
Learnability
Every person who can read and is over 5 years old can learn how to perform all functions of toaster in no more than 5 minutes.
Operability
The toaster has a switcher button, heat roter, that allow user to access all functions described in user's manual.
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Maintainability
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Modifiability
The integrated heater should easily be replaced with another one with (for example) a different saving mode.
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Modularity
It is possible to change toaster's cover to another one with a different color with no impact on the toaster at all.
Functional suitability
Functional correctness
When a user choose a 60-degree temperature on the roter, the heater inside should heat up to this temperature.
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Reliability
Maturity
If the toaster is used according to the user's manual, it will work as expected (according to the manual) for at least 2000 sessions (heatings), but no more than 5 years from the day of purchase. (The heating will need to be replaced).
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Recoverability
With the replacement of main circuit board the toaster should become available for a normal use in no more than 1 second.
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