CORDTRA stands for Chronological-Ordered Representation of Discourse or Tool Related Activity. These diagrams consist of a timeline where multiple processes are ploted in parallel. Basically it is scatter plot where activities follow a certain coding scheme. In my example the usage of video annotations was distinguished into different interactions, e.g. using Popcorn Maker or direct annotation authoring or contributing/starting an electronic assessment (quiz). The input data was captured in a logfile containing activity data together with a unix time stamp.
CORDTRA diagrams can be used to
- count the frequency of an activity,
- identify patterns of sequential or parallel activities,
- compare different groups by their activity (and inactivity),
- monitoring CSCL activity or group performance in real time.
Realisation with D3.js
The code is available here.
Resulting CORDTRA Diagram
- CindyE. Hmelo-Silver, Rebecca Jordan, Lei Liu, and Ellina Chernobilsky. Representational Tools for Understanding Complex Computer-Supported Collaborative Learning Environments. In Sad-
hana Puntambekar, Gijsbert Erkens, and Cindy Hmelo-Silver, editors, Analyzing Interactions in
CSCL, volume 12 of Computer-Supported Collaborative Learning Series, pages 83–106. Springer
- Next Generation DataViz: Drawing Dynamic Visualizations (41.2%)
- Mendeley Analytics - part 1: Data Visualization for collected Publications in Mendeley (41.2%)
- KoviLern: Kooperationsskripts in videograhischen Lernmedien (35.3%)
- Arbeitskreis Learning Analytics in der Fachgruppe E-Learning legt los! (23.5%)