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I. Subject Indexing
lKeyword inconsistency
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lSuboptimal subject categories
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lArtificial domain or institutional boundaries
lDifferent subject headings for different collections (LCSH, MESH)
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lControlling subject heading vocabulary
lManaging a dynamic collection
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lDesigning a good user interface
lIntegrating automatically generated topics into existing systems
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Subject Indexing
Subject indexing (i.e. subject headings) is meant to help users find material.  But it isn’t always successful.  Challenges include:
If a user doesn’t care about the boundaries, they should be transparent
Use of LCSH or own subject categories, controlling vocabulary
Users getting finding aids instead of content, having mix of text and images