Why is it important to search across multiple databases when researching a topic?

• A. It increases coverage and reduces bias by capturing different indexing and coverage.
• B. It makes the process unnecessarily complicated and should be avoided.
• C. Only one database is enough for credible results.
• D. Databases all have identical content; variety adds no value.

Answer: (A)

Using multiple databases is important because each database has its own scope and indexing choices, so no single source covers all relevant material. Different journals, conferences, and books appear in different indexes, and some databases specialize in particular disciplines or regions. By searching across several databases, you increase the chances of finding relevant studies that a single database would miss, which reduces bias from coverage gaps and gives a more complete view of the topic.

You’ll also encounter variations in search terms and indexing vocabularies, so using multiple databases helps capture different synonyms and subject headings that researchers might use. After gathering results, you’ll typically need to remove duplicates and carefully screen for relevance, but the broader reach improves the overall quality and credibility of your research.