Plan and execute an effective search using the following six steps. The screen shots are from the AMED (OVID) database, but the process is applicable to database searching in general.
1. What is the topic?
Discuss the value of physiotherapy interventions in the treatment of lower back pain
2. What are the key concepts?
value, physiotherapy, lower back
3. Are there other ways to express these key concepts, in order to widen the search? Some general examples:
4. For each key concept, join its keywords with OR
5. Link each key concept set with AND, to obtain records which contain at least one of the terms from each concept set:
(value OR importance OR effective) AND (physiotherapy OR physical therapy) AND (low back OR lumbar spine)
While the effect of OR is to widen the search, AND narrows or focuses the search. You may see them referred to as Boolean operators in search guides.
This is how the example search is entered in the OVID search engine using the multifield search option:
From the results list view the records which seem to be the most relevant.
Look for terms within the results, especially Subject terms, which you can use to refine the initial search. The image below shows subject terms appearing in an AMED database record from the search.
Subject terms collectively describe the main themes of the article. The same subject terms will also appear in the records for other articles in the database which substantially cover those themes.
Searching on subject terms can therefore be an effective way of focusing the search on the most relevant articles. They may also suggest terminology or aspects of the topic that you had not considered.
Below is an example of a modified search based on subject terms identified in various records from the initial search. The selection of Subject in the drop down menu will limit the search to only that part of the record. In general, the fields selected for a search do not have to be the same; eg one concept set may be set to subject terms and another in the same search may remain as the default setting (for the AMED databases “All fields”)
Further tips for modifying a search
To focus the initial search:
To widen the initial search:
Typing a truncation symbol after the root of a word will find variations of that word. This can be a powerful way of expanding the search. The truncation symbol is often a star or asterisk (*). For a particular database check the online help to confirm the symbol to use. For example: