Cost-Justifying Usability, 2nd Edition

✦ Response times are slower and less predictable on the Web, limiting which

design techniques are practical

✦ There are little or no existing comprehensive and widely accepted user inter-

face standards for the Web (although various guidelines are available)

✦ Browsers and users, rather than designers and developers, may control much

of the appearance of Web content

✦ Web users may be mainly discretionary and infrequent, increasing the need

for “walk up and use” interfaces

✦ The World Wide Web is a huge and fluid space with fuzzy boundaries

between sites. There is thus an increased need for navigational support and

a “sense of place”

These differences are ...