Are tags from Mars and descriptors from Venus?
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Transcript of Are tags from Mars and descriptors from Venus?
Are tags fromMars and
descriptors fromVenus?
A study on the ecologyof educational resource
metadata
ICWL 2009, AachenAug 19 2009
Presenter: Riina Vuorikari
Presentation
• Introduction: purpose of metadata,context and method
• Results and discussion: How do userstag and what do they click? What doexpert indexers and repositorymanagers think of tags?
• Conclusions
Introduction: metadata forlearning resources
To describe resources.“Descriptor” used forindexing terms.
Usefulness for searchability
Typical LOR=Learning Object
RepositoryLOR with tagging
Metadata ecology
• Describes the interrelation ofconventional metadata (e.g. Learning ObjectMetadata) and social tags, and
• their interactions with the environment– repository,– resources,– stakeholders (e.g. managers, metadata
indexers and the whole community ofusers)
Learning Resource Exchange - Riina VuorikariLearning Resource Exchange for schoolshttp://lreforschools.eun.org
Conventionalsearch
«Fromteachers toteachers»
Tags inmultiple
languages
Ratings andcomments
by the EuropeanCommission’seContentplusProgramme
Learning Resource Exchange - Riina VuorikariTagging to « keep found things found » andhelp to share with other users
Add toFavourites
Add a tag
Method• 234 users, 77 created bookmarks and
tags.• Attention metadata captured on the
portal (user, resource, tags). Details inVuorikari and Koper, 2009.
Results:users and tags
• Users interactdifferently withtags
• 33% of users tag,• but 58% use tags
for searching
Results: how do users tag?
Average does not tell the whole truth!• 20% of resources generated more than half of
all the bookmarks (80% had only one bookmark)
• 20% of resources had more than half of tagsassociated with them them
• 20% of tags have been applied 63% of thetime
Results: how do users tag?
• Users tag in multiple languages in amultilingual context, mostly– in their mother tongue and– in the language of the resource– e.g. about 30 to 50% of tags are in En
• A medium correlation (r= 0.57) betweenthe language of the content and thelanguage of the tag
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Results: “Thesaurus tags”
Results: “Thesaurus tags”• Characteristics:
– 11.3% of distinct user-generated tags exist in theLRE multilingual Thesaurus
– 30.6% of tag applications• Popular:
– On average, these tags were reused 11.8 times(other tags 2.5 times)
• Add properties to tags– e.g. relation to a concept in multilingual
Thesaurus,– language
• Add connections, e.g. all the other resourcesrelated to this thesaurus term
Results: what do users click?
• Tagcloud was used in 22% of all searchactions, users bookmarks 7%
• 11% of distinct tags were used forretrieval purposes
• 20% of distinct tags generated 80% ofclicks
Results: Does the offer of tagsby users match the demand?
• The amount of clickstream (i.e. demand) on atag compared to how many times it had beenadded by teachers (i.e. supply).
• number above 1 means that the tag hasgenerated more clickstream than tagapplications = “attractive” tag
• 21% of tags attractive and 24% equal supplyand demand - demonstrates the flexibility ofthe system to adapt
Results: what do expert-indexersthink of tags?
• Indexers found user-generated tagsoften– factual and descriptive, similar to LOM– suitable (i.e. clear and unambiguous) as
indexing keywords
• Tags a source of non-descriptors to helpretrieval, e.g. “efl” linked to Thesaurus terms“English language” + “foreign language”
Results: what do LOR ownersthink of tags?
• 25% of tags in the Repository casestudy were deemed to add value toexisting indexing
• 75% somewhat redundant informatione.g.– LOM 1.2: Title– LOM 1.3: the language of the resource (English)– LOM 5.2: resource type. Examples: photo, picture; exercises,
games; simulations; quiz, web quest– LOM 5.7: the age group or the pupils being addresses (e.g. young
learners)
Conclusions and future work
• Numerous way of interplay existbetween conventional metadata andsocial tags
• Tags allow multiple ways to interact withthe multilingual environment– repository (e.g. new emerging ways
to navigate)
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Interplay between descriptorsand tags
Descriptor
Tag
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Emerging possibilities
• Tags create link-structures between users,resources, tags and thesaurus descriptors
• These link-structures cross-referencesresources across languages, curricula,repositories, etc.
• Can offer more flexible ways to accessresources in a multilingual and culturalcontext
social bookmarksMetadata LOM tags folksonomy
ecologymulti-linguality social classification
thanks! for your attentionlearning resources Tags
user communitiesresource discovery
questions?teachers social navigation
social tracespaths, trails
http://lreforschools.eun.org