HELL is not automated and is not intended to be exhaustive.
Human judgement is applied in choosing and describing sites for inclusion.
Links to the main Internet directories and resources for specific subject areas are given without the irrelevant items produced by the larger search engines. Links are provided that offer some resource or service rather than self-advertisement. The International Courseware Directory gives links to subject-specific courseware including examination, quizzes and tutorial questions. The Internet abounds with obselete material and webmasters are strongly encouraged to include the date of last revision on all pages. Some descriptive material is given with each link, usually drawn from the associated website.