ERIC indexes a wide variety of journal sources. The coverage of an approved journal source is determined by an examination of three to five current issues during the source review process, but may be updated at any time. Source coverage is defined as follows:

  • Comprehensively indexed journals contain an average of 80% or more education-related articles; ERIC creates a bibliographic record for all articles in every acquired issue.
  • Selectively indexed journals contain an average of 50-79% education-related articles and are critical to topic area coverage; ERIC applies a manual article-by-article selection process and indexes only the articles that conform to the standard and criteria outlined in the ERIC selection policy.


BASE is one of the world’s most voluminous search engines especially for academic web resources. BASE provides more than 300 million documents from more than 10,000 content providers. 

  • BASE includes impressive features, such as…

    • Content providers are indexed only after check by qualified personnel of Bielefeld University Library
    • Only document servers and journals that comply with the specific requirements of academic quality and relevance are included
    • Our list of content providers provides transparency in the searches
    • Discloses web resources of the “Deep Web”, which are ignored by commercial search engines or get lost in the vast quantity of hits
    • Correction, normalization and enrichment of metadata by means of automated methods
    • Mulitlingual search (find search terms in more than 20 translated languages)
    • The display of search results includes precise bibliographic data
    • Display of access and terms of re-use for a document
    • Several options for sorting the result list (by author, title, date)
    • “Refine your search result” options (by author, subject, DDC, year of publication, content provider, language, document type, access and terms of re-use)
    • Browsing by DDC (Dewey Decimal Classification), document type, access and terms of re-use / licence.