1. A taxonomy of web search Andrei Broder IBM Research

2. The need behind a web search: - Informational - Navigational - Transactional Information queries constitute less than 50% of web searches The need behind a query might be : 2

3. Query Den klassiske model for IR Info Need Corpus (Samling) Search Engine Result Query Refinement 3

4. Den klassiske model for IR Task Info Need Verbal form QueryCorpus (Samling) Search Engine Result Query Refinement 4

5. 1- Navigational queries Purpose: to reach a particular site that the user has in mind Eksempler: -American airlines home.(mulig mål: www.aa.comwww.aa.com -Compaq. (mulig mål: www.compaq.com) -National car rental. ( mulig mål: www.nationalcar.com)www.nationalcar.com Resultater som er en klik from målet kan være acceptabel, men mindre ønskelige. news.bbc.co.uk/ news.bbc.co.uk/hi/english/world/ www.bbcworld.com www.bbc.co.uk/arabic/ www.bbcshop.com 5 Jubii: 2.414.119 Google: 1.400.000Altavista: mange

6. 2- Informational queries Purpose: to find informations, assumed to be avalable on the web in a static form IQ er closest to clasic IR 6

7. 3- Transactional queries Purpose: to to reach a site where further interaction will happen -Shopping -Forskellige web – mediated servicer -Downloading forskellige type af filer( image, musik, osv.) -Adgang til bestemte database( nummeroplysning) -Finde servers 7

8. Statistic - Undersøgelse blandt AltaVistas brugere - Alalysis of the query log at AltaVista  Which of the following describes best what you are trying to do? (navigational - non navigational)  I want to get to a specific website that I already have in mind  I want a good site on this topic, but I don’t have a specific site in mind  Which of the following best describes why you conducted this search?  I am shopping for something to buy on the Internet ( T )  I am shopping for something to buy elsewhere than on the Internet ( I )  I want to download a file (e.g., music, images, programs, etc.)  None of these reasons  Which of the following describes best what you are looking for?  A site which is a collection of links to other sites regarding this topic  The best site regarding this topic -24,53% - 68,41% - 8,16% - 5,46% - 22,55% - 57,19% - 14,83% -76,62% 8

9. Statistic - Undersøgelse blandt AltaVistas bruger - Alalysis of the query log at AltaVista Type of queriesUser SurveyQuery log Analysis Navigational24,5%20% InformationalEstimated: 39%48% TransactionalEstimated: 36%30% Queries with sexual content <1%Ca. 12% 9

10. The evolution of search engines: -First generation: on-page data, Informational queries -Second generation: use off-page, link analysis, informational –navigational -Third generation: analysis of need behind the query 10

11. Conclusion: -The need behind a query might be: -Informational -Navigational -Transactional -Search engines need to deal with all 3 -Current search engines deal well with IQ and NQ - 3.generations main aim is to effeciently with TQ, mostly via semantic analyses. understanding what the query is about). 11