Where and how people are.
WHAT VARIES
Location: indoors, outdoors, in transit
Attention: focused or interrupted
Time available Connection quality Whether both hands are free
WHAT OUTDOOR USE MEANS
Glare, which destroys subtle contrast.
WHAT INTERRUPTED USE MEANS
People leave and return.
WHAT TO DO ABOUT THAT
Preserve state Make it clear where they were Allow resuming
WHAT LIMITED TIME MEANS
The primary task must be quick.
WHAT TO OPTIMISE
The most common task, for the most common context.
WHAT TO ESTABLISH
Where and how your users actually are.
WHAT NOT TO ASSUME
A calm user at a desk.
WHAT TO TEST
The main task, standing, outdoors, on mobile data, with interruptions.
WHAT THAT REVEALS
Everything that assumed ideal conditions.
