Originally created by two faculty members from West Chester University, KnowThis.com began in 1998 as the marketing specialty area of the World Wide Web Virtual Library. Although this thoughtful Web directory contains a search feature, it is best browsed through a series of sections, including Advertising and Promotion, Education, and Market Research. Each section includes a short paragraph explaining the scope of the information, as well as a description of the section coverage, which includes the types of resources as well as suggestions as to who will be interested in the sources. KnowThis.com is an excellent example of a carefully planned and information-rich single-topic Web directory.