Protocol
Build a terminology map before optimizing the query
You cannot search a vocabulary you have not discovered yet.
When it fits
- The field uses several names, abbreviations or technical terms for the same idea.
When to avoid it
- Adding every synonym can destroy precision; retain terms that retrieve relevant material in a test search.
Why it matters
Use a few authoritative papers, standards and representative recent sources to collect canonical terms, acronyms, historical names and common wording. Add controlled vocabulary terms when the database supports them. Then rebuild the query from this map instead of guessing synonyms from memory.
Steps
- Canonical technical term is known.
- Common acronym and spelling variants are included.
- Historical or neighboring terms are considered where relevant.
- Database subject headings are checked when available.
- Ambiguous terms that create noise are documented.
An example
A search on 'AI trust' expands to reliance, advice taking, appropriate reliance, confidence calibration and human-AI decision making.
Check your result
At least one high-value search term came from the field's actual language rather than your initial wording.
Keep this limit in mind
- Adding every synonym can destroy precision; retain terms that retrieve relevant material in a test search.
Connected ideas
Useful withUse known-good papers as a search test
Evidence and sources
Cochrane recommends combining free-text terms with controlled subject headings where the database provides them.
Controlled vocabulary differs by database and may lag emerging terminology.
Chapter 4: Searching for and selecting studies · Controlled vocabulary and text words