(See paper for details: http://attempto.ifi.uzh.ch/site/pubs/papers/kuhn08acewiki.pdf )

1. AceWiki:
A Natural and Expressive
Semantic Wiki
Tobias Kuhn
University of Zurich
Semantic Web User Interaction at CHI 2008
Florence
5 April 2008

2. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 2
Introduction
 Semantic Wikis
 Semantic Web meets Web 2.0
 Shortcomings of existing semantic wikis
 Hard to understand for people who are not
familiar with ontologies and logic
 Relatively inexpressive (mostly just subject-
predicate-object structures)

3. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 3
AceWiki approach
 Wiki articles in controlled natural language
 Attempto Controlled English (ACE)
 Easy to understand: ACE is a subset of English
 Expressive: ACE covers a large part of FOL
 Example article:
 Public demo: http://attempto.ifi.uzh.ch/acewiki

4. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 4
AceWiki interface

5. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 5
Predictive Editor

6. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 6
Reasoning
 AceWiki currently uses the OWL reasoner Pellet
 ACE is more expressive than OWL
 The sentences that are inside of OWL get a blue
triangle; the others get a red one
 Sentences that are in conflict with the current
knowledge are not included into the ontology.

7. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 7
Inferences
 Reasoner is used to infer concept memberships and
concept hierarchies.

8. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 8
Usability-Experiment
 Hypothesis: Average people are able to learn how
to deal with AceWiki within a short amount of time
and without the help of an expert.
 Small-scale: 20 participants
 Task for the participants:
 Add knowledge to AceWiki!
 only true and general knowledge
 modify/delete the contributions of others, if
appropriate
 No instructions how to interact with the interface

9. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 9
Background of the Participants
 “How familiar are you with the term ...?”

10. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 10
Results: Correct/Incorrect Sentences
 Altogether 186 sentences were created by the
users.
 148 of them were “correct and sensible”.

11. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 11
Results: Sentence Patterns
 (neg.) superconcept
 (neg.) assignment
 (neg.) role instance
 superrole

12. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 12
Results: Time
 How much time was spent on AceWiki?
 How much time was spent on the predictive editor?

13. Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 13
Thank you for your attention!
Questions & Discussion