usabilty & unusability, examples and considerations
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Roberto DADDA
ergon wokonomoi law, rule
Used for the first time on a polish newspaper
Wojciech Jastrzbowski 1857
Applied to work plece design by the father of ergonomics
Kennet Frank Hywel Murrell 1949
Ergonomics is sometimes defined as the science of fitting the work to the user instead of forcing the user to fit the work. However this is more a primary ergonomic principle rather than a definition.
Ergonomics
Usability
ISO 9241Ergonomic requirements for office work with visual display terminals (VDTs).
ISO 13407Human-centred design processes for interactive systems.
"The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use."(ISO 9241)
Multiple factors
Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
Efficiency: Once users have learned the design, how quickly can they perform tasks?
Memorability: When users return to the design after a period of not using it, how easily can they re establish proficiency?
Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors?
Satisfaction: How pleasant is it to use the design?
Symtoms
The so called evolution of entry phone
Mandala Bay Las Vegas, ha solo 43 piani!
Usability LAB
Eye tracking
robertodadda
Roberto DADDA