The graph below shows some ways to evaluate website effectiveness.

Usability is very important, this is the customer experience, this is the way the visitor looks at the site, the way he gauges its ease of use an value to him. That is a perspective that cannot be overlooked. It is also a perspective that has a clear relation to the business effectiveness of the site.

If the visitor find the usage experience satisfactory, the site has a greater chance to be successful in the long run.

Traffic and Audience Measurement is a set of techniques used to provide effectiveness data vital to marketing management.

Site performance is data that is needed by site technicians to gauge and improve performance in terms of the number of broken links and other errors, speed and downtime.

It is appropriate to look at the usability testing first, since its greatest value comes prior to te actual deployment of a site or a redesign. In advertising terms, it is a pretesting technique that is used to ensure that the site works according to user expectation before it is opened to all visitors.