Directories have been well established within the World Wide Web (WWW) since its inception, mapping the web on a scale that automated crawlers (or bots) cannot. The difference in mapping ability is a direct consequence of the human element that most directories utilise. The difference between a directory and a search engine is that a search engine is automatic, it spiders your site through links pointing at it while using computer algorithms to determine the quality of your site. A human edited directory will have a person looking at your site, looking for elements of spam and assessing the user interface that a search engine cannot. A search engine is unable to interact with a site as a human can therefore creating a vast difference in assessment output.