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Larry Snyder & Mel Oyler, Instructors |
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Ariel Kemp, Isaac Kunen, Gerome Miklau &
Sean Squires, Teaching Assistants |
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University of Washington, Autumn 1999 |
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Mel Oyler will give next 4 lectures |
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Searching |
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Friday 10/8 |
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Introduction to Databases |
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Monday 10/11 |
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Queries |
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Wednesday 10/13 |
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Enterprise Data Warehouses |
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Friday 10/15 |
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Why do we search for information? |
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Because we want information |
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Information reduces our uncertainty about the
state of the world and helps us make decisions |
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Information helps us gain a deeper understanding
of the world |
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We need to do research for that psychology term
paper |
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Ask an expert |
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Your TA |
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Look in my schedule |
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Browse the bookstore |
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Physically browse UW bookstore |
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Electronically browse Amazon.com |
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Browse the library |
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Search the internet |
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Search engines |
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Directories |
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Browsing |
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general |
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Searching |
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specific |
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Indexing |
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Authority |
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Source validity - is the information source
credible? |
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Controlled keyword lists - “authority list” |
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Getting good search results depends on |
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Correct search expressions |
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Well indexed collections of documents |
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Logically correct |
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Restricting the combination of keywords in a
document |
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Syntactically correct |
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Using the correct symbols and punctuation |
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We accomplish this by constructing Boolean
expressions and submitting them to a search engine |
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See search engine handout |
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AND |
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True AND True = True |
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True AND False = False |
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False AND True = False |
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False AND False = False |
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OR |
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True OR True = True |
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True OR False = True |
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False OR True = True |
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False OR False = False |
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Not |
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Not True = False |
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Not False = True |
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The library is very well indexed |
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The internet is not well indexed |
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Getting good search results depends on |
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Correct search expressions |
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Well indexed collections of documents |
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Question Authority |
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Learn to Build Correct Boolean Search
Expressions |
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