Principles of Usability
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Transcript of Principles of Usability
PRINCIPLES ON USABILITY PETER GULLBERG VP TECHNOLOGY STRATEGY
UsabilityONE DEFINITION OF USABILITY…
“When you conveniently can use a product or service and it meets your
expectations.”
Human performance and abilitiesWHAT NEED TO BE CONSIDERED IN USABILITY
Readability
Human memory
Vision
DesignLearnability
#1) Bailey (Human Performance), #2) NASA – On the typography of flightdeck communication
Ergonomics
Visceral design - first see feeling
Behavioural design - the feeling of using the device
Reflective design - what the design communicates
DesignWHAT HAS DESIGN GOT TO DO WITH USABILITY?
Don Norman, the authority in User Interfaces
Affordance is the cues (knowledge in the world) that something signals.
Insert here
Logotype – access to my bank
Clear and instructive display
Understandable legends
Numerical keys clearly separated
Understandable buttons
Screw on battery lid tells customer - ”Yes, can be opened, but only when needed”
Perceiving the worldAFFORDANCE
Learnability is achieved by
• Symmetry in functions (routine cognitive skills)
• Visual cues (knowledge in the world)
• Feedback, Information and Decision
• Fit users mental model (knowledge in the head)
• Repeated use
LearnabilityLEARNABILITY IS IMPORTANT
A+B=110 A is 100 more than B. What is B?
Knowledge in the headTHINGS CAN APPEAR EASY……
A+B=110 A is 100 more than B. What is B?
B=5
Knowledge in the headTHINGS CAN APPEAR EASY……
Knowledge in the worldADDING CONTEXT
Increased awareness Increased cognitive
processing for the relevant details
Increased usability Understandable function Increased intent (more
secure).
Amount: 1,234.00
Knowledge in the worldTHE 10 EURO NOTE
But, what’s on the frontside?
Knowledge in the worldTHE 10 EURO NOTE
But, what’s on the frontside?
ECB Presidentsignature
Microprint
Euro flag
Hypotethicaldoorwayarchitecture
The see throughsplit ”10”
Perceiving the world?SOME THINGS ARE JUST HARDWIRED…..
Can you spot the difference?
Perceiving the world?SOME THINGS ARE JUST HARDWIRED…..
Can you spot the difference?
Search and explore is how people learn new complex things and products.
Example is the remote control, do tightrope walking or your new iPod etc.
Would you dare do tightrope walking?
Exploring the WorldSEARCH AND EXPLORE
People are afraid of loosing - by human design
When that happens - search and explore stops
Same line, just different location - still same answer?
The same goes for PIN…
Exploring the WorldWHEN DO SEARCH AND EXPLORE STOP?
Design is important, wrong cues will cause problems
And Security have to be balanced with usability
Usability and Security have opposing value, and need to be balanced
DesignDESIGN IS IMPORTANT
TrustTRUST IS THE RESULT OF A USABLE PRODUCT
T=r+dTrust = reliability + delight
Trust comes from meeting and
beating customer expectations.
What is usability?USABILITY IS ABOUT MAKING THINGS EASY AND UNDERSTANDABLE FOR
THE USER
Progressive DisclosureFOCUS ON RELEVANCE
Progressive DisclosureFOCUS ON RELEVANCE
What is usability?SUCCESS CRITERIA’S FOR A SECURITY SOLUTION
• User friendly• Logical functionality• Reason of usage• No cryptic texts • I-follow-you• Context support• Portability.
Books I would recommendGOOD LITTERATURE FOR PRODUCT MANAGERS AND USABILITY SPECIALISTS
Emotional Design – Don NormanPredictably Irrrational – Dan ArielyThe design of everyday things – Don NormanHuman Performance Engineering - Bailey
THANK YOU FOR YOUR ATTENTION