Keywords (also called search terms) are words that describe your research topic. Keywords are chosen by you. Keyword searching is how you search in Google and Bing. You think of important words or phrases, type them into a search box, and get results.
- Pros: Easy.
- Cons: Not very precise. Results in a lot of irrelevant and useless search results.
Subjects (also called controlled vocabulary) are words that an article has been tagged with because the article is mostly about those subjects. Subjects are a quick way to find the most relevant articles on a topic, but you have to be careful because the only place the database searches for those words is in that Subject field. If you don't have the right words to search with, you'll get no results. You find Subjects listed in articles that are relevant to your topic, type them into a search box, change the "field to search" to Subject, and get results.
- Pros: Results in relevant, topic-specific results. You will see way fewer irrelevant or useless results.
- Cons: Harder - subjects may not be phrases you would think of off the top of your head.
Keywords |
vs. |
Subjects |
off-the-top-of-your-head words describing your topic |
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"controlled vocabulary" words describing the content of each database item |
more flexible to search by - can combine together in many ways |
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less flexible to search by - you need to know the exact pre-determined subject term |
databases and search engines look for keywords anywhere in the record - not necessarily connected together |
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databases look for subjects only in the subject heading field, where the most relevant words appear |
may yield many irrelevant results |
|
results usually very relevant to the topic |