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The Boolean Logic, Searching the Internet and Evaluating Websites

The Boolean Logic, Searching the Internet and Evaluating Websites

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• 1. Welcome Mrs. Powell’s College Comp Students!
Go to http://maldfrontier.blogspot.com/
Think: What is the author of this cartoon saying about the Internet?
• 2. Respond:
Using the link Today’s Meet on Mrs. Maldonado’s Blog – “What is the author of this cartoon saying about the Internet?”
• 3. Searching with Success
Why is how we search the Internet important?
• 4. Search Engine
Information is collected by a computer program and indexes all of the information
Provides a huge number of sites
Search Directory
People, not computers, index information.
Editors evaluate Web sites and organize them into subjects.
Number of sites are much smaller, but higher quality
Search Engine VS Search Directory
• 5. Your science teacher tells you to find out if mercury is toxic.
Type mercury and hitting the enter key.
How many pages are retrieved?
Look over the description of the first few sites. What are they about?
Mercury Vehicles
Mercury Element
Mercury Planet
PRACTICE
• 6. The Boolean Logic
Searching technique that can narrow your search to a reasonable number of results, and increase your chance of having useful results
Consists of three operators or commands
OR
AND
NOT
Conducting a Successful Search
• 7. AND
Means “I want only documents that contain both/all words.”
OR
Means “I want documents that contain either word.”
(AND) NOT
Means I want documents that contain this word, but not if the documents contains another word.
Boolean Basics
• 8. Each operator can be visually described by using Venn diagrams.
OR logic
QUESTION: I would like information about college.
college OR university
The OR logic retrieves records in which AT LEAST ONE or both of the search terms are present.
Boolean Basics
• 9. AND logic
QUESTION: I am interested in the relationship between poverty and crime.
poverty AND crime
The AND logic retrieves records in which BOTH of the search terms are present.
Boolean Basics
• 10. NOT logic
QUESTION: I want information about cats, but I don’t want to see anything about dogs.
cats NOT dogs
The NOT logic retrieves records in which ONLY ONE of the term is present, excluding records from your search results.
Boolean Basics
• 11. Your science teacher tells you to find out if mercury is toxic.
Mercury has many different meanings. How can we use the Boolean operators to narrow down our search?
PRACTICE
• 12. 5 Keys to Evaluating Web Pages
• 13. What can the URL tell you?
• Is it somebody’s personal page?
• 14. What type of domain does it come from?
• 15. Government - .gov or .mil
• 16. Educational - .edu
• 17. Non-profit - .org
• 18. Who published the page?
• 19. Have you heard of the agency or person?
• 20. Does it correspond with the name of the site?
• Scan the web page
• Look for About Us, Philosophy, Biography, Background, etc.
• 21. Determine who wrote the page
• 22. Looking for someone claiming accountability or responsibility
• 23. Is the page dated? Is it current enough?
• 24. What are the author’s credentials on the subject?
• Indicators of quality information
• Look for types of publications
• 25. Are sources documented with footnotes?
• 26. Where did the author get their information from?
• 27. Is the information complete, not altered, fake or forged?
• 28. Are there links to other sources
• What do others say?
• What other pages link to this site?
• 29. View page information
• 30. Is the page listed in one or more reputable directories or pages?
• 31. What do others say about the author?