Automatic vs manual indexing

1
Automatic vs manual indexing

• Focus on subject indexing
• Not a relevant question?
• Wherever full text is available, automatic
  methods predominate
• Simple inverted index of text words
• More sophisticated vector-based models with
  weighting/ranking facilities
• Assignment systems which map to controlled terms

2
Automatic vs manual indexing

• Manual indexing
• Gather docs across languages, vocabularies etc
• Adapt to retrieval needs of particular user
  groups
• Offer vocabulary assistance to users in search
  process
• Adapt to needs for varying degree of specificity
• Allow consistent retrieval over time
• Allow for navigation, hierarchically or to
  related topics

3
Automatic vs manual indexing

• User problems
• Express need (problem) in terminology appropriate
  to
• Problem
• System terminology
• Changing user habits
• Searching vs. browsing

4
Automatic vs manual indexing

• Problems with manual indexing
• Cost
• capacity
• Consistency quality
• Mapping between systems
• Constructing maintaining vocabularies

5
Automatic vs manual indexing

• Integration automatic / manual
• Automatic categorization
• Term mapping (topics)
• Ranking mechanisms