Slids of the presentation at the Crox meeting

1. Usability, key factor for the success of web user
interface: an agile approach
Roberto DADDA Lubjana November 7, 2012

2. Usability
“The effectiveness, efficiency and satisfaction with
which specified users achieve specified goals in
particular environments.”
● effectiveness: the accuracy and completeness with which specified users can
achieve specified goals in particular environments
● efficiency: the resources expended in relation to the accuracy and completeness of
goals achieved
● satisfaction: the comfort and acceptability of the work system to its users and other
people affected by its use
Roberto DADDA Lubjana November 7, 2012

3. Usable,
a many-sided
concept
Functional (it does what it is claimed to do)
●
Reliable (it works consistently)
●
Usable (it works in a way that is consistent with the user's expectations)
●
Meaningful (it does something important or valuable)
●
Pleasurable (it is enjoyable to use)
●
Roberto DADDA Lubjana November 7, 2012

4. NOT about colors, fonts...
Roberto DADDA Lubjana November 7, 2012

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7. Ergonomics
Roberto DADDA Lubjana November 7, 2012

8. Usability is an application of ergonomics,usability
is mandatory when errors are fatal and was
developed in medical, nuclear and avionics.
Roberto DADDA Lubjana November 7, 2012

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13. human processor model
Roberto DADDA Lubjana November 7, 2012

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16. ●Add value via Web
●Benefit and usability greater than phone call
●Find-Choose-How to-Track
●On site test
●3.5 visitors/day
●Dismissing 80% of call center workforce
Roberto DADDA Lubjana November 7, 2012

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18. ✗ After reworking for Christmas +80% (average 40%)
✗ 300.000 repeat customers (+67%)
Roberto DADDA Lubjana November 7, 2012

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20. Unusable!
Roberto DADDA Lubjana November 7, 2012

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32. Roberto
DADDA
October 26, 2011 PBZ ­ Zagreb 32

33. Roberto
DADDA
October 26, 2011 PBZ ­ Zagreb 33

34. Roberto DADDA Lubjana November 7, 2012

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37. Surface
Skeleton
Structure
Scope
Strategy
Roberto DADDA Lubjana November 7, 2012

38. user tasks:
Surface • enter numbers
• enter text
• enter formulas
• format cells
Skeleton • sort information
• filter information
• aggregate information
Structure • graph data
• save data
• import data
Scope • export data
• print
• …..
Strategy
Roberto DADDA Lubjana November 7, 2012

39. Surface
task
Skeleton panes
Structure modal dialogs
Scope
modal wizards
Strategy
Roberto DADDA Lubjana November 7, 2012

40. Roberto
DADDA
Surface
Skeleton
Structure
Scope
Strategy
May 14­15, 2012 Agile Croatia Conference ­ Zadar 40

41. Surface
Skeleton
Structure
Scope
Strategy
Roberto DADDA Lubjana November 7, 2012

42. Rules
●Know the user, and You are not the user.
●Things that look the same should act the same.
●The information for the decision must be there when the decision is needed.
●Error messages should actually mean something to the user and tell the user how to fix the
problem.
●Every action should have a reaction.
●Everyone makes mistakes, so every mistake should be fixable.
●Don't overwhelm the user.
●Consistency, consistency, consistency.
●Minimize the need for a mighty memory.
●Keep it simple.
●The user should always know what is happening.
●The more you do something, the easier it should be to do.
●The user should control the system. The system should not control the user. The user is the boss
and the system should show it.
●Eliminate unnecessary decisions and illuminate the rest.
●The best journey has the fewest steps. Shorten the distance between the user and the goal.
●User should be able to do what they want.
●Alert users to an error before things get worse.
●Users should always know how to find out what to do next.
●Strive to empower the user, not speed up the system.
●Things that look different should act different. Lund, A. M. (1997). Expert ratings of usability
maxims. Ergonomics in Design, 5(3), 15-20. A
study of the heuristics design experts consider
important for good design.
Roberto DADDA Lubjana November 7, 2012

43. Do not focus on tools
Tools are like a taxy, use it when needed, pay and
get an other when if needed
Roberto DADDA Lubjana November 7, 2012

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45. Agile is like
to be
pregnant, or
u are or u
are noT!
Roberto DADDA Lubjana November 7, 2012

46. We need all the team COMMITED, when u make
eggs and bacon chicken is involved, pig is
committed to the project:
We do need pigs!
Roberto DADDA Lubjana November 7, 2012

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48. We do need a team of cathedral builders, not
just stone carvers!
Roberto DADDA Lubjana November 7, 2012

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51. And now 2 minutes of marketing:
Our offer!
Roberto DADDA Lubjana November 7, 2012

52. specify
AUC 2
design
test
program
design
Agile Usability Coaching & Collaboration
Roberto DADDA Lubjana November 7, 2012

53. roberto@dadda.it www.dadda.it
robertodadda
Roberto DADDA Lubjana November 7, 2012