02 Web Search

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02 Web Search

  1. 1. Google is not enough Fall 2009, Class 2 Prof. Scott Moore http://www.howcanifindit.com/
  2. 2. Finding information can be frustrating.
  3. 3. You search in your job search, for classes, for personal reasons.
  4. 4. Lots more information available now.
  5. 5. And lots more technology (hardware and software), too.
  6. 6. Knowledge is now the ability to learn and the ability to find
  7. 7. Tools are evolving for specialized needs.
  8. 8. Multiple tools are needed to meet your diverse and changing needs
  9. 9. The changing context of search is driving the need for new tools.
  10. 10. Changing operating context Then Now
  11. 11. Changing operating context Then Now Experts You & me
  12. 12. Changing operating context Then Now Experts You & me Well-defined queries Ill-defined
  13. 13. Changing operating context Then Now Experts You & me Well-defined queries Ill-defined Thousands of documents Billions of documents
  14. 14. Understanding search engines will help you be a better searcher.
  15. 15. Search tools can have several functions Search tools s s
  16. 16. Search tools can have several functions Search tools generate Query results & structure s s Document set
  17. 17. Search tools can have several functions Search tools generate explore Query results & structure s s Document set
  18. 18. Search tools can have several functions Search tools generate explore Query results monitor changes & structure s s Document set
  19. 19. Categorizing search engines
  20. 20. Categorizing search engines Query terms
  21. 21. Categorizing search engines Query terms and
  22. 22. Categorizing search engines Query terms and or
  23. 23. Categorizing search engines Query terms and or Search target addresses images scholarly blogs maps news HTML PDF financial video books
  24. 24. Categorizing search engines Indexed information Query terms and or Documents Search target addresses images scholarly blogs maps news HTML PDF financial video books
  25. 25. Categorizing search engines Indexed information Query terms and (Full text) Search engine or Text Documents Search target addresses images scholarly blogs maps news HTML PDF financial video books
  26. 26. Categorizing search engines Indexed information Query terms and (Full text) Directory Search engine or Text Meta info Documents Search target addresses images scholarly blogs maps news HTML PDF financial video books
  27. 27. * + ~ - Different search not “” engines support intitle: different special link: search terms & inurl: operators. site:
  28. 28. Evaluating a search engine’s performance
  29. 29. Evaluating a search engine’s performance Relevant
  30. 30. Evaluating a search engine’s performance Retrieved
  31. 31. Evaluating a search engine’s performance Relevant Retrieved
  32. 32. Evaluating a search engine’s performance Relevant Retrieved B C A
  33. 33. Evaluating a search engine’s performance Relevant Retrieved B C A Retrieved & relevant
  34. 34. Evaluating a search engine’s performance Relevant Retrieved B C A Not retrieved but relevant Retrieved & relevant
  35. 35. Evaluating a search engine’s performance Relevant Retrieved B C A Not retrieved but relevant Retrieved & Retrieved but relevant not relevant
  36. 36. Evaluating a search engine’s performance Relevant Retrieved B C A Recall = B A+B Not retrieved but relevant Retrieved & Retrieved but Precision = B B+C relevant not relevant
  37. 37. Evaluating a search engine’s performance Relevant Retrieved B C A Recall = B A+B Not retrieved but relevant Retrieved & Retrieved but Precision = B B+C relevant not relevant
  38. 38. We can understand search engines even better if we think about the process of searching.
  39. 39. Deconstructing the search experience Search Query Engine Results Subset Searchable of Web information
  40. 40. Deconstructing the search experience Variety & usefulness of special queries Automation Search Query Engine Results Subset Searchable of Web information
  41. 41. Deconstructing the search experience Variety & usefulness of special queries Automation Search Query Engine Content (pages, categories, paid links) Results Format of results Delivery form Subset Searchable of Web information
  42. 42. Deconstructing the search experience Variety & usefulness of special queries Automation Search Query Engine Content (pages, categories, paid links) Results Format of results Delivery form Target Subset Searchable of Web information Quality of Opacity coverage
  43. 43. Deconstructing the search experience Variety & usefulness of special queries Automation Search Query Engine Content (pages, categories, paid links) Results Format of results Delivery form Target Subset Searchable of Web information Quality of How frequently Opacity coverage updated?
  44. 44. Deconstructing the search experience Variety & usefulness Quality of of special queries the experience Automation Search Query Engine Content (pages, categories, paid links) Results Responsiveness Format of results Delivery form Target Subset Searchable of Web information Quality of How frequently Opacity coverage updated?
  45. 45. Considering: Google Indexed information Query terms default Search target Special search Automation Content terms & operators How frequently Quality of coverage Opacity updated? Quality of the Responsiveness experience
  46. 46. Will students learn that just Googling something isn’t always the right thing to do?
  47. 47. Busy students might spend too much time unsuccessfully searching for information.
  48. 48. Multiple tools are needed to meet your diverse and changing needs
  49. 49. Students learn how to effectively and efficiently find information using the right tool.
  50. 50. Start working through the exercises to begin to learn about search.

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