directory limited to a specific subject area such as education, or Tasmania. Sometimes called a 'portal'.

Web-based mechanism for accessing a collection of high quality, evaluated resources identified to support research in a particular subject discipline. It is a service characterised by its quality control, accessed via a portal through open standard protocols which allow it to slot in seamlessly behind the scenes. A further implementation of such service is the quality-controlled subject gateway.

An Internet site set up to provide an easy link to other information servers giving useful subject based information in a particular discipline. Commonly used examples of this type would be the HUMBUL, EEVL and SOSIG gateways.

an Internet service listing (usually) on-line resources for a particular subject area. The resources included will have been reviewed by subject specialists before inclusion.