What is BASE?

BASE is an academic search engine developed by the Bielefeld University Library in Germany. It indexes over 240 million documents from more than 8,000 sources, including institutional repositories, digital collections, and open-access journals. Approximately 60% of the indexed materials are available as full-text open access, making it a valuable tool for students and researchers.

How Does BASE Work?

1. Metadata Indexing: BASE harvests metadata from institutional repositories and academic databases using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH).
2. Search Engine: Users can search bibliographic metadata (e.g., titles, authors, abstracts) but not full text.
3. Open Access: Provides direct links to open-access content when available.
4. Advanced Filters: Allows users to refine search results by document type, subject, language, publication year, and more.

Why Use BASE?

• Extensive Coverage: Access to millions of academic documents across disciplines.
• Open Access Focus: Prioritizes free and legal access to scholarly content.
• Advanced Search Features: Offers tools like Boolean operators and faceted filtering for precise searches.
• Transparency: Displays detailed bibliographic data and terms of reuse for each result.

Key Features

Search & Discovery

• Indexes metadata from repositories, journals, and digital libraries.
• Includes resources from the "Deep Web" that are often missed by commercial search engines.
• Supports Boolean operators for refining queries (e.g., AND, OR, NOT).

Filtering Options

• Document type: Articles, theses, reports, patents, etc.
• Subject area: Humanities, sciences, engineering, etc.