• Usability is deﬁned by ﬁve quality components:
‣ 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 after a period of not
using it, how easily can they reestablish proﬁciency?
‣ Errors: How many errors do users make, how severe,
and how easily can they recover?
‣ Satisfaction: How pleasant is it to use the design?
• From Usability 101: Introduction to Usability, Jakob Nielsen
• Find users from the audience your site is
intended to serve
• Create a list of tasks for users to perform
on your site
• Observe them as they perform the tasks
• Ask them speak aloud about their
choices or when they don't understand
Keep These in Mind
• Do not help your test users or tell them
where to click.
• Remind them that you are not testing
them–the site is what's being tested.
There's no wrong way to perform the tasks.
• You can test your site with as little as ﬁve
people. As soon as you start seeing a
pattern, you've probably discovered an
issue that you can revise and test again.
First Rule of Usability? Donʼt Listen to Users by Jakob Nielsen
• Before delivering a ﬁnal site to your
audience, you'll want to make sure that it
• Important: Test that it doesn't do
anything you didn't intend
• Sometimes called Bug Testing