The length of time it takes to find what you're looking for
If you found what your looking for
If you could you find it again
If the navigation was stressful
Target Audience Profile
Background demographics
Web Usage / Skill Level
Geography
Media Consumption Habits
Ethnicity and / or nationality
Content
should take up 50%-80% of the web design real-estate
You have 10 seconds
while downloading to keep the
users focused attention
Top site average 8 seconds
to display as compared to the
WWW mean of 19 seconds
Pages that are <33 Kb have 7-10% of users leave the site before it
completes downloading
Pages that are >40 Kb have a 25-30%
bail out.
Web vs. Print
When reading a magazine the user must expend a lot of energy to change to a different magazine...
...on the Web,change is a click away, making the user less likely to stick with any site that doesn't keep their attention.
Your site should be tested by someone who is Red - Green colorblind