Searching for information online or in academic databases often comes down to two techniques: keyword searching and subject searching. Mastering both can transform the precision, breadth, and relevance of your research results in today’s vast digital information landscape.
What Are Keywords and Subject Terms?
Keywords are the words or phrases you naturally think of when describing your topic. They use conversational or ordinary language, and when searched, scan multiple fields like titles, abstracts, and even the full text, depending on the system.[2][4] This method is flexible but can return many broad or irrelevant results.
Subject terms (also called subject headings or descriptors) are from a controlled, predetermined vocabulary assigned to each item in a database or catalog. They specifically describe the content from an authoritative list, such as the Library of Congress Subject Headings.[2][4][6] Searching by subject offers higher precision but depends on discovering the right headings for your topic.
How Do Keyword and Subject Searches Differ?
- Scope: Keyword searches scan all major record fields, while subject searches focus on one field: the subject or descriptor.
- Specificity: Keywords are broad and flexible; subject terms are precise and standardized by experts.
- Results: Keyword searching often yields more (and more varied) results; subject searching provides fewer but closely related results.[4][10]
- Discovery: Keyword searching helps identify relevant subject headings; these can then refine and focus future searches.[2][4]
When (and Why) to Use Each Method
For initial exploration or when you’re unsure of official terminology, start with a keyword search. This casts a wide net, helps you see what terms authors and catalogers use, and points the way to accepted subject headings.[2][4]
If you need high precision or want to ensure you’re viewing materials formally classified under a topic, switch to subject searching using the identified subject headings.[2][6]
Strategic Approach: Combining Both for Optimal Results
- Start broad with keyword searching in your own words.
- Note the most relevant search results and examine which subject terms are assigned.
- Redo your search using these subject terms to target precise resources.[2][4]
This two-step strategy leverages the strengths of both approaches, providing comprehensive and focused results.
Advanced Tips for Search Success
- Use synonyms and related terms. Database thesauri help to identify correct subject headings and alternative keywords.[4]
- Employ Boolean operators. Combine search terms with AND, OR, NOT to narrow or broaden results (e.g., “entrepreneurship AND innovation”).[4]
- Truncate keywords. Add an asterisk (e.g., invest*) to capture variations like investment, investor, investing.[4]
- Phrase searching. Enclose exact phrases in quotes to avoid scattered results (e.g., “tech startups”).[4]
- Analyze best results. Use the subject terms in the most relevant records to guide further searching.[2][4]
- Track and adapt your search strategy. Many databases allow you to save and tweak searches for ongoing improvements.[4]
Why Mastering Both Matters: Practical Impact
In the digital era, leveraging both keyword and subject strategies is essential. For example, according to a 2024 OCLC report, over 65% of research database users start with a keyword search but only 20% exploit subject headings—despite the latter yielding higher precision (OCLC Global Library Survey, 2024).[2][4] Additionally, a recent SEMrush trend analysis found that 70% of organic search visibility improvements come from refining keyword strategies in tandem with subject-based content structuring (SEMrush, 2023).[1][3]
Three Essential Tips to Improve Your Search Results
- Always begin broad, then refine. Start with keywords, then use subject terms from initial results to focus your search.
- Use tools and thesauri built into academic and business databases to find synonyms and official subject headings.
- Combine both methods in your strategy to ensure you capture the nuances of specialized topics like innovation or investment in tech startups.
Inspiration: Harness the Community, Drive Innovation
Deep research is foundational for entrepreneurship, investment decisions, and innovative contributions in dynamic fields like tech startups. By mastering keyword and subject search approaches, you empower yourself to uncover richer insights, new perspectives, and hidden opportunities. Join a global community of lifelong learners and knowledge seekers—your next breakthrough could be just one refined search away.
