Module 3- Searching and Sorting CSI Finding Information on the Internet.

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Presentation transcript:

Module 3- Searching and Sorting CSI Finding Information on the Internet

What are Search Engines? AA web search engine searches for information on the web. MMost search engines operate algorithmically and automatically. TThey are like a well-trained dog – they will ‘fetch' what you want, but only if you use the right commands.

Search Engines Extra… oSoSearch Engines use ‘Spiders’, special programs to ‘crawl’ the Internet to find results. MMore ‘keywords’ are better as this means more relevant results and fewer hits are returned.

Can you name any Search Engines?   

Too many results? Confused?!  Use inverted commas “” around a phrase to limit number of results.  Enter the phrase transition year in Google.  Now try it with inverted commas i.e. “transition year”.  How relevant are the links on the first one or two pages of the result and how many results did you get each time?

Searching with the help of Mr. Boole.  A Boolean Search is made up of keywords connected by logical operators AND (+), OR(/), and NOT(-).  Named after George Boole, first professor of Mathematics at Queen’s College Cork, now U.C.C.  Computers cannot understand human language, but they can match words.  By using a combination of keywords and boolean operators you will improve the results of your search.

What’s it all about? Over to you…  Try the following examples: Search for “italian restaurants” +ireland. Search for ireland +football/hurling. Search for “Famous Irish People” –sport.  Compare your results when you don’t use “” or boolean operators.

Another Useful Tool…  For longer pages the ‘Find on this Page’ function helps you to find words on a page.  Click on the magnifying glass and choose ‘Find on this Page’ from the menu.  Type the word you want to find and it will be highlighted on the page.  You can also use the shortcut ‘Ctrl F’.

Treasure Hunt UUse websites given and/or Search Engines to find the answers. WWrite the first letter of each answer in the spaces provided. UUnscramble the letters to find the 8-letter magic word! Good luck!

Finally… Choosing which Websites  How is the information published on the internet different to information in respected books, magazines and journals?  How can you decide if a website is reliable?

Website Evaluation Form  Find a website on a topic that interests you.  Answer the questions on the Website Evaluation Form, based on the website you have chosen.  The more ‘Yes’ answers you have, the more trustworthy the website is.

Discussion – What do you think?  What are the most important questions on the Evaluation Form?  Why are these the most important questions?