Usability - what is it & why is it important

1. What’s USABILITY all about?
Is it important?

2. Usability is concerned with
improving a user’s experience with
an online/technology product or
service

3. “If the user can’t use
it,
it doesn’t work”
- Susan Dray

4. “A field study identifies twenty-two
ways that automated hospital
systems can result in the wrong
medication being dispersed to
patients....”

5. ...most of these flaws are classic
usability problems that have been
understood for decades”
Jakob Nielsen
http://www.useit.com/alertbox/
20050411.html

6. YES it is very important :)

7. Users (that’s your customers)
need to be at the center of usability

8. Usability is necessary to survive.
- If it’s difficult to use, people leave.
- If users get lost, they leave.
- If users don’t understand how to
use a service, they leave.
- If users do not understand the value
of using a service, they leave.
- If it’s hard to read or doesn’t address
their key questions, people leave.

9. User-centered design

10. User-centered design
NEEDS

11. User-centered design
NEEDS
EXPERIENCE

12. User-centered design
NEEDS
EXPERIENCE
GOALS

13. User-centered design
NEEDS
EXPERIENCE
GOALS
THOUGHTS

14. User-centered design
EXPECTATIONS NEEDS
EXPERIENCE
GOALS
THOUGHTS

15. User-centered design
EXPECTATIONS NEEDS
FEELINGS EXPERIENCE
GOALS
THOUGHTS

16. User-centered design
EXPECTATIONS NEEDS
FEELINGS EXPERIENCE
CONTEXT OF GOALS
USE
THOUGHTS

18. Key factors:
- Copy (labels/instructions/error messages)
- Information architecture (data organisation)
- Interaction design & work flow
- Interface/visual design (layout/look and feel)

19. Defined by 6 quality components:

20. 10 Usability Heuristics by Jakob Nielsen
Visibility of system status
The system should always keep users informed about what is going on,
through appropriate feedback within reasonable time.
Match between system and the real world
The system should speak the users' language, with words, phrases and
concepts familiar to the user, rather than system-oriented terms. Follow real-
world conventions, making information appear in a natural and logical order.
User control and freedom
Users often choose system functions by mistake and will need a clearly marked
"emergency exit" to leave the unwanted state without having to go through an
extended dialogue. Support undo and redo.
Consistency and standards
Users should not have to wonder whether different words, situations, or actions
mean the same thing. Follow platform conventions.

21. 10 Usability Heuristics by Jakob Nielsen
Error prevention
Even better than good error messages is a careful design which prevents a
problem from occurring in the first place. Either eliminate error-prone conditions or
check for them and present users with a confirmation option before they commit to
the action.
Recognition rather than recall
Minimize the user's memory load by making objects, actions, and options visible.
The user should not have to remember information from one part of the dialogue to
another. Instructions for use of the system should be visible or easily retrievable
whenever appropriate.
Flexibility and efficiency of use
Accelerators -- unseen by the novice user -- may often speed up the interaction
for the expert user such that the system can cater to both inexperienced and
experienced users. Allow users to tailor frequent actions.

22. 10 Usability Heuristics by Jakob Nielsen
Aesthetic and minimalist design
Dialogues should not contain information which is irrelevant or rarely needed.
Every extra unit of information in a dialogue competes with the relevant units of
information and diminishes their relative visibility.
Help users recognize, diagnose, and recover from errors
Error messages should be expressed in plain language (no codes), precisely
indicate the problem, and constructively suggest a solution.
Help and documentation
Even though it is better if the system can be used without documentation, it may
be necessary to provide help and documentation. Any such information should be
easy to search, focused on the user's task, list concrete steps to be carried out, and
not be too large.

23. Within the first 50 milli-
seconds of using a web-site
users have formed an
impression
- Tobian & Spiegel 2006
(Carleton University, Ontario USA)

24. How can you make your
site more use-able?

25. Nailing the work-flow

26. IA / Site Maps

27. Knowing your users (personas)

28. Interaction design (wireframes)

29. “The joy of an early release
lasts but a short time. The
bitterness of an unusable
system lasts for years.”
- Anonymous

30. Make sure your product
or online service is at
it’s best!