how people recognize previously seen web pages from titles, urls and thumbnails
DESCRIPTION
www.pages.ca … /index.html Saul Greenber … d Groupware. How People Recognize Previously Seen Web Pages from Titles, URLs and Thumbnails. Shaun Kaasten Saul Greenberg Christopher Edwards University of Calgary. - PowerPoint PPT PresentationTRANSCRIPT
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How People Recognize Previously Seen Web Pages from Titles, URLs and Thumbnails
Shaun KaastenSaul GreenbergChristopher EdwardsUniversity of Calgary
www.pages.ca … /index.htmlSaul Greenber … d Groupware
A rough transcript of the talk accompanying this presentation is visible in the Edit Slides view
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The Message
We can improve our web browsers by quantifying how people recognize previously seen web pages from its thumbnail, title and URL representation
www.pages.ca … /index.htmlSaul Greenber … d Groupware
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Motivation
People revisit pages with surprising frequency
– 60% of all pages were seen before!
All pages
60%
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All pagesMotivation
People revisit pages with surprising frequency
– 40% were seen 6 or fewer pages ago
60%
~40%
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All pagesMotivation
People revisit pages with surprising frequency
– 20% were seen further back
~20%
60%
History Bookmarks
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Recognizing previously seen pages
Back/ForwardClick until recognize
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Recognizing previously seen pages
History / BookmarksRecognize page abstraction in a list
History Bookmarks
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FACTS
Recognizing titles
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Recognizing URLs
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https://dciswp.admin.ucalgary.ca/cgi_bin/ndCGI.exe/zsis_menu?SPIDERSESSION=FF%7cqT%5ddqyTXqApoH%5f%40KzBFJuCrEXVAK%5bFwoE%5dG%5bVK%5f%5b%60fPs%60mpOXFpq%5b%5bdZh%5bDXq%3f%5dcuCy%3fa%40V%7cryRsWgACDLqAy%5bjNh%5bdlq%5bmdQm%7ddqEY%5dw%7efIryVIhbWsUBBnA%5biY%60mNw%5bGwo%5eAPoR%5f%3f%5bqfQCpCtqX%3fQIGFf%5fEDw%5bzHWs%3fMPC%5fb%3fkra%40we%3fRY%3fyPXU%5bm%60s
Recognizing URLs
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Recognizing page thumbnails
MosaicGAyers & Stasko
DataMountainRobertson et al
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Recognizing page thumbnails
Unified HistoryKaasten and Greenberg
WebViewCockburn, Greenberg et al
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Recognition and representation size
Browsers limit representation size
27 characters 28 characters
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Recognition and representation size
Title and URL truncation
Titles URLs
Right University of Calgary -- C...http://www.cpsc.ucalgary.c...
Middle University of...nce Home Page http://www.cp...plab/software
Left ...omputer Science Home Page ....gary.ca/grouplab/software
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Recognition and representation size
Browsers limit representation size
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Experiment
How well do people recognize previously seen pages from different sizes of its title, URL or thumbnail?
Step 1:collect actual pages a subject visited before the study
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Experiment
Step 2: find threshold where they can just recognize:– web site– exact page
wwwww.www.cpwww.cpscwww.cpsc.uwww.cpsc.ucawww.cpsc.ucalgwww.cpsc.ucalgarwww.cpsc.ucalgary.www.cpsc.ucalgary.cawww.cpsc.ucalgary.ca/~swww.cpsc.ucalgary.ca/~sauwww.cpsc.ucalgary.ca/~saul/www.cpsc.ucalgary.ca/~saul/inwww.cpsc.ucalgary.ca/~saul/indewww.cpsc.ucalgary.ca/~saul/index.hwww.cpsc.ucalgary.ca/~saul/index.htmwww.cpsc.ucalgary.ca/~saul/index.html
S…e Sa…ge Sau…age Saul…Page Saul … Page Saul G…e PageSaul Gr…me Page Saul Gre…ome Page Saul Green…Home Page Saul Greenb… Home Page Saul Greenbe…– Home Page Saul Greenber… – Home PageSaul Greenberg…r – Home Page Saul Greenberg,…or – Home Page Saul Greenberg, …sor – Home Page Saul Greenberg, P…ssor – Home Page Saul Greenberg, Pr…essor – Home Page Saul Greenberg, Professor – Home Page
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Experiment
Step 3: have them validate their guesses
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Research Question #1
What is the tradeoff between thumbnail recognition vs. image size?
– web site– exact pages
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0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
16 48 80 112 144 176 208 240 272 304size (in pixels)
% o
f a
ll s
ub
jec
ts' a
ns
we
rsWeb site recognition
Exact page recognition
Thumbnails - recognition vs size
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Thumbnails - recognition vs size
32
48
96
160
48
80
144
208
15%
30%
60%
90%
Web site Exact page
This slide skipped during the live presentation
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Research Question #2
What makes thumbnails recognizable?
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Thumbnails – what makes them recognizable?
Web site
Exact page
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Research Question #3
What is the tradeoff between title recognition vs. truncation size?
– web site– exact pages
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Title – web site recognition vs size
Right truncationGrouplab Resear…
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Title – exact page recognition vs size
Middle truncationGrouplab… ome page
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Research Question #4
What is the tradeoff between URL recognition vs. truncation size?
– web site– exact pages
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URL – web site recognition vs size
Right truncationwww.ucalgary.ca/...
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URL – exact page recognition vs size
Left truncation…/thumbnailstudy.html
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Research Question #5
What is size distribution of titles and URLs?
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Title and URL length distribution
Titles
URLs
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Research Question #6
How correct are people’s guesses about thumbnails, titles and URLs?
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Correctness / Error rates of guesses
Web site Exact page
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Summary
Size required for identification
Recognitionrate
Thumbnails Titles
web exact web site exact page
site page right middle left right middle left
Minimal: 15% 322 482 6 8 9 12 12 12
Low: 30% 482 802 8 12 12 18 16 18
Medium: 60% 962 1442 15 20 18 39 30 28
High: 80% 1602 2082 25 42 28 – 46 50
Maximum 92% 90% 92% 87% 93% 75% 83% 80%
Recognitionrate
Urls
web site exact page
right middle left right middle left
Minimal: 15% 8 14 11 15 16 14
Low: 30% 11 20 17 25 22 19
Medium: 60% 16 29 25 43 34 30
High: 80% 34 43 42 58 65 50
Maximum 92% 87% 92% 83% 82% 88%
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322 thumbnail•15% web site
1282 thumbnail•60% page
30 letters•50% page
A live demo of this system was done during the presentation
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Summary
We quantified how people recognize previously seen web pages from its thumbnail, title and URL representation.
We can use this to analyze or improve our existing browsers.
www.pages.ca … /index.htmlSaul Greenber … d Groupware
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For more information
www.cpsc.ucalgary.ca/grouplab/
Thanks to NSERC and Microsoft for funding