8CS1 - 8.4.5 - Tightening the web

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Slide 1: Slide
ComputingLower Secondary (Key Stage 3)

This lesson contains 36 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 60 min

Items in this lesson

Slide 1 - Slide

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Recap: What does this HTML tag allow us to do to a web page:

<img src …….>

Slide 2 - Open question

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8.4.5 - Tightening the web
Year 8 – Developing for the Web

Slide 3 - Slide

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Mr Hughes' expectations
It’s ok to be wrong.

Cold calling, everybody needs an answer.
Listen when others are speaking.
Work on teams. Today’s lesson on the slides.
No shouting out – hands up for any questions.
Don't wait for me to tell you what to do with the tasks.




Slide 4 - Slide

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Learning Objectives
  • Use search engine terms effectively
  • Discuss how the choice of search terms affects the information you find
  • create hyperlinks to navigate between multiple web pages

Slide 5 - Slide

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Name 3 parts of a search engine

Slide 6 - Slide

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How does a search engine work?

Slide 7 - Slide

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Think. Pair. Share
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1:00

Slide 8 - Slide

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Fish: Live in water and are cold-blooded.
Mammals: Can be found in water or on land are warm-blooded and their young drink milk.
Amphibians: Can be found in water or on land and are cold-blooded.
Birds: Have feathers and can fly.
Reptiles: Can be found on land and are cold-blooded.
Arthropods: Have more than four legs and are old-blooded.

Slide 9 - Slide

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Overlapping groups


“Which animals can live in water?”

Slide 10 - Drag question

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Slide 11 - Slide

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What would we type into google to narrow our search results to just display birds?

Slide 12 - Open question

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Which animals have feathers?

Would be a great question to ask Google

Slide 13 - Slide

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If you want fewer answers, you can include more details to narrow your search results

What would you add to this question to have amphibians and mammals as the answer?

“Which animals can live in water ………… can live on land?”

Narrowing results

A
AND
B
OR
C
NOT

Slide 14 - Quiz

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Sometimes you may want a broader range of answers, so you would specify two separate parts to the questions.

What word could you add to a question to have both mammals and arthropods as the answer?

“Which animals drink milk as babies ………… have more than four legs?”

Combining groups
A
AND
B
OR
C
NOT

Slide 15 - Quiz

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You can ask questions that eliminate groups that you don't want as part of the answer.

What word could you add to a question to only get arthropods as the answer?

“Which animals do ………… have fewer than five legs?”

Excluding groups
A
AND
B
OR
C
NOT

Slide 16 - Quiz

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If you asked: “Which animals have wings AND are NOT warm-blooded?”

The answer would be:



Combining parameters
A
Reptiles
B
Arthropods
C
Mammals
D
Birds

Slide 17 - Quiz

Birds, arthropods (ladybirds) and mammals (bats) have wings but only arthropods have cold blood.
Excluding groups

You can ask questions that eliminate groups that you don’t want as part of the answer.

What word could you add to a question to only get arthropods as the answer?

“Which animals do ………… have fewer than 5 legs?”

A
AND
B
OR
C
NOT

Slide 18 - Quiz

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Search engine index
Search engines like Google use software called crawlers. They catalogue a huge number of web pages each day.


Depending on what we search for, there could be billions of web pages that match each possible keyword.

In the same way that you narrowed down the results of animal searches, you can narrow the number of results found by search engines.

Slide 19 - Slide

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Default searches
The default of a search engine is to return results using the AND operator.


This requires all keywords to be present on any place on the web page returned as part of the search.

This search engine has found 58.6 million results for Edinburgh AND castle.

Slide 20 - Slide

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Controlling searches
Search engines provide operators to help control a search more carefully:


Slide 21 - Slide

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Controlling a search
You are going to investigate the impact these operators have on the number of results returned by a search engine.







Once you have all finished, we will compare the number of results you got and see who has used search terms and operators to the best effect.






Slide 22 - Slide

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I Do
Alan Turing and Grace Hopper Google searches using only the keywords "turing" and "hopper'



Slide 23 - Slide

turing hopper - how many results?



We Do
Alan Turing and Grace Hopper Google searches using only the keywords "turing" and "hopper'

Workbook on teams



Slide 24 - Slide

turing and hopper - how many results?

turing not how many results?

"turing hopper" - how many results?

We Do
  • Open google in Chrome
  • Type in "turing" into the browser - note the amount of results
  • Type in 'hopper" - note the amount of results


Slide 25 - Slide

turing - how many results?

hopper - how many results?

We Do

  • Type in "turing -hopper" How many did we get?

Slide 26 - Slide

turing -hopper - how many results?



You DO
Task 1 on todays teams (8.4.5 - tightening the web)

Top tips: Search parameters are 

OR
- (NOT)
" " (Phrase

timer
5:00

Slide 27 - Slide

turing -hopper - how many results?



Many web pages
So far we have only considered single, standalone web pages.

We know from experience that many web pages are connected together to form websites.
We browse between pages of a site using hyperlinks.


Slide 28 - Slide

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Hyperlinks in HTML
Web pages are modified using a tag that marks text or images as ‘clickable’ to link through to a different page.


<a href="RPi4.htm">
  <img src="TopView.jpg">
</a>


Image file “TopView.jpg” hyperlinked to HTML file RPi4.htm.

<a href="RPi4.htm">Find out more</a>

Text “Find out more” on page hyperlinked to HTML file RPi4.htm.

Note that the target HTML file needs to be in the same folder as the starting page as you saw in lesson 2.

Slide 29 - Slide

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Building a high quality web site
Using the webpage from last lesson, open in notepad++ and the browser.

1) Create a link in the HTML above the closing body tag





2) Create a new file in Notepad++ called search_engines.html and add 3 <p></p> tags with new content on the HTML which summarises how to use different search parameters effectively, specifically:
  • How OR works
  • How NOT works (the - symbol)
  • How phrase searches work (using “” marks)

 

timer
10:00

Slide 30 - Slide

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Take a screenshot of your webpage and upload it here (WIN + SHIFT + S, save your screenshot to your documents and upload below)

Slide 31 - Open question

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Slide 32 - Slide

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Slide 33 - Slide

7,320,000,000

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Slide 36 - Slide

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