0
9th IEEE International Conference on Collaborative
Computing: Networking, Applications and Worksharing
Austin, Texas, Unit...
Lehrstuhl Informatik 5
(Information Systems)
Prof. Dr. M. Jarke

I5-KRNK-0713-2

Responsive
Open
Community
Information
Sys...
Agenda
Motivation
 Background and related work
 System design & implementation
 Evaluation
 Conclusions and outlook

...
Motivation


Computer supported near real-time (NRT) collaboration
–
–
–
–



Technology availability (e.g. XMPP, WebRTC...
IMS Learning Design(IMS LD)
Authoring

A specification used to describe a “learning design” of
a “unit of learning”
 Desc...
Problem Identification

Lehrstuhl Informatik 5
(Information Systems)
Prof. Dr. M. Jarke

I5-KRNK-0713-6
Real-time Collaborative Editing


Synchronous editing independent of the location of the
users
– Every user is aware of a...
Related Work


IMS LD authoring tools
Tool

NRT Collaboration

Async. Sharing

ReLoad [9]

Desktop

N/A

N/A

ReCourse [2...
Key Contributions


SyncLD: Web-based NRT collaborative IMS learning
design authoring tool
– Web-based application
– NRT ...
ROLE Framework

Web widget (Collaborative Web Component)
Lehrstuhl Informatik 5
(Information Systems)
Prof. Dr. M. Jarke

...
SyncLD





Multi-user chat and
presence awareness
(based on ROLE SDK)
Visual modelling for
activities
Tree structure a...
SyncLD Architecture

Lehrstuhl Informatik 5
(Information Systems)
Prof. Dr. M. Jarke

I5-KRNK-0713-12
Implementation


XMPP
– Suitable protocol for NRT communication
– Multiple extensions available (publish subscribe, multi...
Operational Transformation (OT)


OpenCoWeb framework
– Javascript OT peer to peer client-side library
– Modifications to...
Operations and the OT Engine

Lehrstuhl Informatik 5
(Information Systems)
Prof. Dr. M. Jarke

I5-KRNK-0713-15
User Evaluation


5 evaluation sessions within the METIS project
–
–
–
–
–



Predefined authoring scenario
4 steps
3 us...
User Evaluation Results

Lehrstuhl Informatik 5
(Information Systems)
Prof. Dr. M. Jarke

I5-KRNK-0713-17
Technical Evaluation & Challenges



ROLE messaging infrastructure for NRT collaboration
setting
OT Engine performance (c...
Conclusions and Future Work


SyncLD
– Supports NRT collaborative editing of learning design models and
was perceived hig...
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Browser-Based Collaborative Modeling in Near Real-Time

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Nicolaescu, P., Derntl, M., Klamma, R.: Browser-Based Collaborative Modeling in Near Real-Time. In Proceedings of 9th IEEE International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom 2013). Austin, TX, USA: IEEE (2013)

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Transcript of "Browser-Based Collaborative Modeling in Near Real-Time"

  1. 1. 9th IEEE International Conference on Collaborative Computing: Networking, Applications and Worksharing Austin, Texas, United States Browser-Based Collaborative Modeling in Near Real-Time Petru Nicolaescu, Michael Derntl, Ralf Klamma RWTH Aachen University Advanced Community Information Systems (ACIS) {lastname}@dbis.rwth-aachen.de Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-1 This project has been funded with support from the European Commission. This presentation reflects the views only of the authors, and the Commission cannot be held responsible for any use which may be made of the information contained therein. This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
  2. 2. Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-2 Responsive Open Community Information Systems Community Visualization and Simulation Community Support Community Analytics Requirements Engineering Web Analytics Web Engineering Advanced Community Information Systems (ACIS)
  3. 3. Agenda Motivation  Background and related work  System design & implementation  Evaluation  Conclusions and outlook  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-3
  4. 4. Motivation  Computer supported near real-time (NRT) collaboration – – – –  Technology availability (e.g. XMPP, WebRTC) Large-scale adoption of collaborative systems Enables higher productivity Improved results as output Support communities of practice with collaboration technologies beyond Google Docs – Communities reluctant to adopt NRT collaboration – Case study: enabling co-design support for teacher communities by redesign of IMS Learning Design stand-alone applications  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-4 Framework for NRT collaborative modelling OpenGLM [24], COLLAGE [8], RELOAD [9]
  5. 5. IMS Learning Design(IMS LD) Authoring A specification used to describe a “learning design” of a “unit of learning”  Describes the teaching-learning process of a unit of learning (a course, a seminar, etc.)  Metis project  – supporting co-design for communities of practitioners using authoring tools (e.g. collaborative learning)  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-5 Three levels of implementation – Level A: core elements – Level B: adds control of properties and conditions – Level C: adds notification to level B
  6. 6. Problem Identification Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-6
  7. 7. Real-time Collaborative Editing  Synchronous editing independent of the location of the users – Every user is aware of actions of his collaborators – Editor responsiveness similar to single-user applications – Consistency maintenance   Inconsistencies caused by divergence or causalityviolation [11] (Sun et al., 1998) Two approaches for consistency preservation – Conflict prevention (Xue et al., 2000) – Conflict resolution [11] (Sun et al., 1998)  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-7 Architectures – Centralized architecture (client/server) – Decentralized architecture (peer-to-peer)
  8. 8. Related Work  IMS LD authoring tools Tool NRT Collaboration Async. Sharing ReLoad [9] Desktop N/A N/A ReCourse [23] Desktop N/A N/A OpenGLM [24] Desktop N/A + WebCollage [8]  Application Type Web-based N/A + Near real-time collaboration systems System Type NRT Collaboration Apache Wave [17] NRT collaboration platform Federated Etherpad (etherpad.org) Collaborative text editor Client - Server Google Real-time API Client-side collaboration APIs Client - Server GROVE [16] Collaborative text editing system Client - Server OpenCoWeb Open-source NRT collaboration framework P2P / Client-Server (developers.google.com/drive) Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-8
  9. 9. Key Contributions  SyncLD: Web-based NRT collaborative IMS learning design authoring tool – Web-based application – NRT concurrent editing in a decentralized context based on open-source software and Operational Transformation (OT) – Visual modelling – Use case for NRT collaborative modelling  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-9 Evaluation of usability for the Web-based synchronous learning design authoring
  10. 10. ROLE Framework Web widget (Collaborative Web Component) Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-10 Space (shared by multiple users) EU FP7 ROLE Project http://role-sandbox.eu/
  11. 11. SyncLD    Multi-user chat and presence awareness (based on ROLE SDK) Visual modelling for activities Tree structure and property editing available – – – – –   Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-11 Activities Environments Roles Role-parts Resources NRT property changes NRT shared editing for text-based fields
  12. 12. SyncLD Architecture Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-12
  13. 13. Implementation  XMPP – Suitable protocol for NRT communication – Multiple extensions available (publish subscribe, multi-user chat) – Client and server support (Smack, Strophe, Openfire, ejabberd)  Open source ROLE SDK based on Apache Shindig – User management – Personal and collaborative widget space management – XMPP-based multi-user chat  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-13 Inter-widget communication (IWC) – Local IWC based on HTML5 Web Messaging API – Remote IWC based on XMPP Publish Subscribe XEP – Strophe.js (XMPP over Bosch and WebSockets)
  14. 14. Operational Transformation (OT)  OpenCoWeb framework – Javascript OT peer to peer client-side library – Modifications to integrate with the ROLE infrastructure and to support the IMS LD model Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-14
  15. 15. Operations and the OT Engine Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-15
  16. 16. User Evaluation  5 evaluation sessions within the METIS project – – – – –  Predefined authoring scenario 4 steps 3 users per session 1 IMS LD authoring expert Concurrent model modifications Questionnaire – 7 multiple choice questions – Open questions  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-16 Targets – Experience synchronized Web-based collaborative IMS LD authoring while increasing the chance of concurrent edits – Usability and usefulness of the tool – Compare the output for consistency
  17. 17. User Evaluation Results Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-17
  18. 18. Technical Evaluation & Challenges  ROLE messaging infrastructure for NRT collaboration setting OT Engine performance (consistency preservation) Integration of the open source projects  Challenges   Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-18 – Awareness for multiple users – Late-join support – Import functionality
  19. 19. Conclusions and Future Work  SyncLD – Supports NRT collaborative editing of learning design models and was perceived highly useful by designers – Open source integration for enabling NRT collaboration – XMPP-based NRT messaging infrastructure – OT client framework for ensuring data integrity and consistency – Web-based authoring better perceived than desktop  Lehrstuhl Informatik 5 (Information Systems) Prof. Dr. M. Jarke I5-KRNK-0713-19 Future work – Potential integration with the Integrated Learning Design Environment (ILDE) in the METIS project – Awareness widget and activity tracker – Provide nudges for collaboration support – Abstraction of the NRT collaboration framework for arbitrary models using flexible modeling processes
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