web usability model

after google~ing....i realized that there are model that you can refer to about web usability.
here i present u the first model (Web usability: the simple framework):-

based on Loosely (2007)

To satisfy customers, a Web site must fulfill four distinct needs:

• Availability: A site that's unreachable, for any reason, is useless.
• Responsiveness: Having reached the site, pages that download slowly are likely to drive customers to try an alternate site.
• Clarity: If the site is sufficiently responsive to keep the customer's attention, other design qualities come into play. It must be simple and natural to use – easy to learn, predictable, and consistent.
• Utility: Last comes utility -- does the site actually deliver the information or service the customer was looking for in the first place?

Now...The second model of web usability:-

Mixture methods (Hermie)

Visibility Analysis
Learn how users explore your website. What gets looked at and what doesn't.
Efficient visibility is a prerequisite for a website to be intuitively usable. Visibility analysis studies eye movements on the relevant pages with the help of the innovative
- How do users' eyes move across a web page?
- How much attention is paid to the different regions?
- Is attention directed to the relevant elements?

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