In addition, reputable print publications that present statistical information usually give the date when the statistics were collected. On the Internet, because there are no established guidelines for including dates on Web pages, it can be difficult to determine the currency of Web resources. Frequently, dates of publication are not included on Web pages. If a date is included, it may be interpreted as the date when the material first was created, when it was placed on the Web, or when the Web page was last revised. Coverage and Intended Audience Coverage is the range of topics included in a work and the depth to which those topics are addressed.
Intended audience is the group of people for whom material was created.
Print sources frequently include a preface or introduction at the beginning of the publication explaining the topics the work includes, the depth or level to which these topics are addressed, and the intended audience for the material. If this explanatory material is not included, a table of contents or an index may provide similar information. Even if all these features are lacking, a print source usually can be scanned or browsed through to determine the coverage of information and the audience for whom it is written. On the Internet, because sites often lack the equivalent to a preface or introduction, the coverage and intended audience of the material often is not readily apparent. Because browsing through Web pages often is a tedious process, determining the range of topics and depth to which they are covered can be readily determined only if an index or site map is present.