As web technology advances, web developers are creating more dynamic site interfaces and are providing more resources in searchable databases. When a search engine spider encounters a database, it can index only the location of the database, but nothing about the resources contained within it. These invisible resources are rapidly increasing, and many of their databases are maintained by educational institutions and government agencies and contain a great deal of scholarly information. There are a number of subject directories providing access to the invisible web, including the following. Because of the variety of sources, ease of publication, lack of central control and proliferation of commercial information on the Internet, it is often hard to tell if the information you are accessing is reliable.
Many sites contain research and information of high quality.
However, unlike traditional print publications, there is usually no process of peer review, nor is there an editor verifying the accuracy of information presented on the Internet. In some cases, an Internet site may be akin to an electronic tabloid publication. You should not automatically accept the information you are retrieving at face value. The following web sites will help you evaluate web sources.