Different web pages on a web server are associated with different qualification profiles, each of which is assigned a value by the web-site proprietor. Traffic data hits at the web-site are analyzed to determine which web pages the visitor viewed on the web server. Each qualifying visitor is thereafter associated with a qualification profile and a corresponding value. In another aspect of the invention, visitors arriving as a result of an advertisement on a remote web-site are tracked. The web-site proprietor is consequently able to determine a return on advertising investment based on the value of visitors brought to the site by the tracked advertisement.