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1.
Surrogate Search: Search a set of predefined words that point to
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related
documents. Requires indexing via
some controlled
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vocabulary.
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pros:
natural transition from paper systems
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cons:
limited access; human indexing required
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2.
Full-Text Search: Search every word in every document.
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pros:
broaden access; possible to automate indexing
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cons:
words rather than concepts
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3.
Knowledge-Based Search: Search a set of concepts that are
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related
to concepts in documents.
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pros:
improved retrieval
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cons:
computationally expensive; theoretical at present
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