Internet Research Skills Internet Research Skills WorkshopWorkshop

Presented By:Presented By:Paul ChisholmPaul Chisholm

Program Resource TeacherProgram Resource TeacherGateway Education CentreGateway Education Centre

March 6, 2007March 6, 2007

Internet Search EnginesInternet Search Engines

http://www.paul-chisholm.com/search_engines.htm

Major Search Engines And Major Search Engines And DirectoriesDirectories

Major search engines get the their name Major search engines get the their name from the fact that they are popular and in from the fact that they are popular and in wide spread use.wide spread use.

There are two major methods used for There are two major methods used for updating web search engines; automated updating web search engines; automated crawlers or spiders (i.e. crawlers or spiders (i.e. GoogleGoogle) and ) and human maintained directories (i.e. human maintained directories (i.e. YahooYahoo).).

Crawler type search engines will reflect the Crawler type search engines will reflect the changes and modifications made to a web site changes and modifications made to a web site over time. They actually will come back to a site over time. They actually will come back to a site to obtain site updates.to obtain site updates.

Human maintained directories rely on a site Human maintained directories rely on a site summary to be submitted to a web search summary to be submitted to a web search engine or for a web site to be reviewed and engine or for a web site to be reviewed and written up by the search engine’s human staff. written up by the search engine’s human staff. Modifications made after the initial submission Modifications made after the initial submission will not be reflected in the directory. will not be reflected in the directory.

A third type of search engine is known as a Hybrid Search Engine (i.e. MSN Search). A hybrid search engine would present search results from both crawler sites and human maintained directories.

You also have Metasearch Engines (i.e. Metacrawler) that are used to search a number of search engines at once.

A crawler or spider based search engine has three (3) main components:The Spider or Crawler that will automatically go to a web site and explore all of the web pages and all of the links from the web pagesThe Index which is a collection of all of the materials that the spider findsAnd finally the Search Engine software itself. This is the software application that searches through the search engine’s index.

Web Site Ranking

An Internet search engine can return an excessively large number of results from each search that is executed.

Sometimes it is desirable to limit the number of search results returned with a search engine query.

Search engines try to rank their results in the form of relevance using a computer algorithm.

A search engine algorithm will look at the words in the title of a web page or in the first couple of paragraphs of a web page to see if there is a match entered with the word or words entered by the search engine user. The thought being that the web page’s content will be displayed somewhere near the beginning of the web page document.

A search engine will also look at the number of times that a search word appears in a web page, the higher the number of occurrences, the greater the relevance to the search.

The goal of any webmaster is to have their web site returned in search results in the highest position possible, thus saving would be web site visitors from having to go through a large number of returned results before coming upon their site.

Boolean Searching

In order to limit the number of results In order to limit the number of results returned to us by a search engine; we may returned to us by a search engine; we may find it necessary to use the following find it necessary to use the following Boolean operators:Boolean operators:

ANDAND

OROR

AND NOTAND NOT

NEARNEAR

Boolean commands should always be Boolean commands should always be entered in entered in UPPER CASEUPPER CASE!!

ANDAND - Requires that all search terms be - Requires that all search terms be present in the results of found web pages. present in the results of found web pages. (i.e. Bush AND Kerry)(i.e. Bush AND Kerry)

OROR - Will display any of the terms listed in - Will display any of the terms listed in the original query to be displayed in the the original query to be displayed in the results. (i.e. IBM OR Microsoft)results. (i.e. IBM OR Microsoft)

AND NOTAND NOT - Requires that a particular - Requires that a particular search term not be listed in the returned search term not be listed in the returned results. (i.e. Bush AND NOT Kerry)results. (i.e. Bush AND NOT Kerry)

NEARNEAR – Will return results where the – Will return results where the words are found in close proximity to each words are found in close proximity to each other. The actual number of words apart other. The actual number of words apart will vary with the search engine.will vary with the search engine.

i.e. dogs NEAR catsi.e. dogs NEAR cats

When searching for a phrase, you will When searching for a phrase, you will want to encapsulate your phrase in double want to encapsulate your phrase in double quotation marks.quotation marks.

i.e. “pan pizza”i.e. “pan pizza”

i.e. "pan pizza" AND "Italian pepperoni" i.e. "pan pizza" AND "Italian pepperoni" AND "black olives"AND "black olives"

You can also use brackets to nest your You can also use brackets to nest your search criteria.search criteria.

i.e. "pan pizza" AND (pepperoni OR ham) i.e. "pan pizza" AND (pepperoni OR ham) AND olivesAND olives

Truncation or wildcards*Truncation or wildcards*

In most search engines and directories, a In most search engines and directories, a search for dog* will give you pages with all search for dog* will give you pages with all words starting with the three letters dog, words starting with the three letters dog, including dog, dogs, dogged, doggy and including dog, dogs, dogged, doggy and dogma. As you can see, if you were dogma. As you can see, if you were looking for dog and dogs, you will be looking for dog and dogs, you will be picking up some unwanted hits. Truncation picking up some unwanted hits. Truncation or wildcards works best when the stem is or wildcards works best when the stem is longer and if the stem is not a root of many longer and if the stem is not a root of many other common words.other common words.

SynonymsSynonyms

Note also that Google has introduced a Note also that Google has introduced a special "tilde"-operator that lets you search special "tilde"-operator that lets you search for synonyms. If you place the tilde sign for synonyms. If you place the tilde sign ("~") immediately in front of a keyword, ("~") immediately in front of a keyword, Google will replace that keyword with a list Google will replace that keyword with a list of words with a similar meaning, thus of words with a similar meaning, thus extending your search. extending your search.

Simplified Search Syntax Simplified Search Syntax

In place of using the previously mentioned In place of using the previously mentioned Boolean operators, most Internet Search Boolean operators, most Internet Search Engines will allow you to use simplified Engines will allow you to use simplified search syntax in the form of:search syntax in the form of:

+pizza +pepperoni +ham -olives -garlic +pizza +pepperoni +ham -olives -garlic

The above example replaces AND with a The above example replaces AND with a + symbol and AND NOT with a – symbol+ symbol and AND NOT with a – symbol

Please note that there must not be any Please note that there must not be any space between the relevant sign and the space between the relevant sign and the word! Write +"Star Wars", not + " Star word! Write +"Star Wars", not + " Star Wars ".Wars ".

SUMMARYSUMMARY Boolean TermBoolean Term Simplified Simplified Search SyntaxSearch Syntax

Must be presentMust be present ANDAND ++

Must not be Must not be presentpresent

AND NOTAND NOT --

May be presentMay be present OROR (add no sign)(add no sign)

Search for the Search for the complete complete phrasephrase

" "" " " "" "

NestingNesting ( )( ) (not available)(not available)

Field SearchingField Searching

Field Searching allows you to search on Field Searching allows you to search on the individual categories that search the individual categories that search engines store their search results on.engines store their search results on.

TitleTitle: This is the text you can read in the : This is the text you can read in the bar at the top of the browser window (not bar at the top of the browser window (not the main headline on the webpage itself).the main headline on the webpage itself).

i.e. petunias AND title:gardeningi.e. petunias AND title:gardening

URLURL: This is the address (the Uniform : This is the address (the Uniform Resource Locator) of a page, e.g. Resource Locator) of a page, e.g. http://www.paul-chisholm.comhttp://www.paul-chisholm.com..You may restrict your search to pages with You may restrict your search to pages with addresses that contain a certain word. If addresses that contain a certain word. If you want to restrict your search to you want to restrict your search to Dreamweaver, you can do a search like Dreamweaver, you can do a search like this: "ColdFusion" AND inurl:www.paul-this: "ColdFusion" AND inurl:www.paul-chisholm.comchisholm.com

DomainsDomains

Domains: The domain is the unique name Domains: The domain is the unique name that identifies an Internet site. Domain that identifies an Internet site. Domain Names have two or more parts, separated Names have two or more parts, separated by dots.by dots.

Some search engines allow you to restrict Some search engines allow you to restrict your search to a specific domain. By doing your search to a specific domain. By doing a domain-search you may for instance a domain-search you may for instance restrict your search to pages in a specific restrict your search to pages in a specific country. British pages normally end in the country. British pages normally end in the letters .uk. A search for Jaguar AND car letters .uk. A search for Jaguar AND car AND domain:.uk should give you British AND domain:.uk should give you British pages containing information on the pages containing information on the Jaguar car.Jaguar car.

There are also some top level domains There are also some top level domains (com, org, net etc.) that are not restricted (com, org, net etc.) that are not restricted to specific countries, although they are to specific countries, although they are predominantly American. You can use predominantly American. You can use these endings to restrict your search to these endings to restrict your search to commercial (.com), US educational (.edu), commercial (.com), US educational (.edu), US governmental (.gov) or US military US governmental (.gov) or US military (.mil) sites. In Canada you see .ca (.mil) sites. In Canada you see .ca domains and in Ontario, you will domains and in Ontario, you will see .on.ca domains.see .on.ca domains.

Menu Based Web SearchingMenu Based Web Searching

Image SearchingImage Searching

ReferencesReferences

Please note that the following web site Please note that the following web site tutorial was used extensively in the tutorial was used extensively in the preparation of this slide show:preparation of this slide show:

The Pandia Goalgetter – A Short And Easy The Pandia Goalgetter – A Short And Easy Internet Search TutorialInternet Search Tutorial

Located at the following URL:Located at the following URL:

http://http://www.pandia.com/goalgetterwww.pandia.com/goalgetter

Please feel free to contact me if you have Please feel free to contact me if you have any questions regarding this presentation:any questions regarding this presentation:

Paul ChisholmPaul ChisholmProgram Resource TeacherProgram Resource TeacherGateway Education CentreGateway Education CentreE-mail: E-mail: paul.chisholm@ucdsb.on.capaul.chisholm@ucdsb.on.caPhone: 888-779-2559 Ext. 4202Phone: 888-779-2559 Ext. 4202