Lectures for the course "Ergonomics applied to the usability of web pages and apps" held at the School of design of Politecnico di milano in the first semester of 2021-2022 academic year

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ERGONOMICS APPLIED TO THE DESIGN OF USABLE WEB
PAGES AND APPS
Roberto DADDA and Paolo NEGRI

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Quality, Ergonomics
&Usability
Our main goal!

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Quality
• In business, engineering, and
manufacturing, quality has a
pragmatic interpretation as the
non-inferiority or superiority of
something; it's also defined as
being suitable for its intended
purpose (fitness for purpose)
while satisfying customer
expectations. Quality is a
perceptual, conditional, and
somewhat subjective attribute
and may be understood
differently by different people.
Wikipedia

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Ergonomics
• Human factors and
ergonomics (commonly referred to
as human factors) is the application
of psychological and physiological
principles to the (engineering and)
design of products, processes, and
systems. The goal of human factors
is to reduce human error, increase
productivity, and enhance safety
and comfort with a specific focus
on the interaction between the
human and the thing of interest.
wikipedia
Leonardo da Vinci, Vitruvian man

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SFCO 1906

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Definition
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)
ἴσος (equal)

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Learnability
• How easy is for the users to accomplish basic tasks the first time they
encounter the design?

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Efficency
• Once the users have learned the design how quickly can they perform
the tasts?

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Memorability
• When users return to the design after a period of not using it how
easily can they re estabilish proficency?

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Errors
• How many errors the user makes, how severe are these errors and
how easily can they recover from errors?

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Satisfaction
• How pleasant is it to use the design?

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User experience

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Usability

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Usability: key factor of success

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Necessary but not sufficient

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Usability
Roberto DADDA
roberto@dadda.it
www.dadda.it
Skype, Facebook e Twitter robertodadda