www.computerscienceuk.com Starter How do search engines work?
Write down your thoughts on a mini whiteboard 5 minutes
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www.computerscienceuk.com Learning Objectives Understand how
search engines work Understand some tools to search smarter improve
our search results by reducing search results and increasing their
relevance. Lesson Outcomes To explain how a search engine works. To
try out some advanced tools and see how they improve our search
results. Literacy Key Words IndexAnother name for a database of
websites. Boolean Operators AND OR NOT logic statements used to
improve database searches. RelevanceHow close the information
matches what you were looking for.
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www.computerscienceuk.com Hands up if you can explain how a
search engine works (i.e. what happens when you press the search
button?)
Slide 5
www.computerscienceuk.com How the Google search engine works:
http://www.youtube.com/watch?v=BN HR6IQJGZs
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www.computerscienceuk.com Summary Google has a big database
(index) containing millions of web addresses Each web address has a
list of words and the number of times they appear in the site. So
when you search the web, you are not actually searching the web.
You are searching the google database. You are finding all the
websites which contain the word(s) you have searched for. Class!
YES!
Slide 7
www.computerscienceuk.com Hands up if you can explain how a
search engine works (i.e. what happens when you press the search
button?)
Slide 8
www.computerscienceuk.com Hands up if you can explain what
Boolean Operators do?
Slide 9
www.computerscienceuk.com One in a Billion So we have just seen
that there are billions of websites listed on Googles Database.
Searching for the 1 website we need can be a difficult job. But
there some advanced techniques that we can use.lets learn the
tips!
Slide 10
www.computerscienceuk.com Advanced Search Tips Using Boolean
Operators You can use Boolean operators (special words and symbols)
to drill down and find the information you need. OR Quotes Minus
Sign -
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www.computerscienceuk.com What happens if we type CHEDDAR
CHEESE into Google? ? Do we get what we want? Or do we get lots of
unwanted websites as well?
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www.computerscienceuk.com Normal Google Search Key Words:
Cheddar Cheese Finds websites containing the words CHEDDAR and
CHEESE but not necessarily together CheddarCheese Ignores websites
that just have the word CHEDDAR Ignores websites that just have the
word CHEESE
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www.computerscienceuk.com Advanced Google Search Key Words:
Cheddar OR Cheese Finds websites containing the words CHEDDAR and
CHEESE but not necessarily together CheddarCheese Finds websites
that just have the word CHEDDAR Finds websites that just have the
word CHEESE
Slide 14
www.computerscienceuk.com Advanced Google Search Key Words:
Cheddar -Cheese Ignores the sites that have the word CHEDDAR and
CHEESE in them CheddarCheese Finds websites that just have the word
CHEDDAR Ignores websites that just have the word CHEESE
Slide 15
www.computerscienceuk.com Advanced Google Search Key Words:
Cheddar Cheese Will display the sites that have the phrase CHEDDAR
CHEESE.
Slide 16
www.computerscienceuk.com Hands up if you can explain what
Boolean Operators do?
Slide 17
www.computerscienceuk.com What is a GOOGLE WHACK! A GOOGLE
WHACK A Googlewhack is a type of contest for finding a Google
search query consisting of exactly two words without quotation
marks, that returns exactly one hit.
Slide 18
www.computerscienceuk.com Complete the Search Smart Worksheet
Activity 2
