Combining STACK and GeoGebra for better feedback

Guido Pinkernell, Heidelberg University of Education, Germany

STACK offers the possibility of Combining STACK and GeoGebra for better feedback. When placed in feedback, interactive applets allow for what could be called "activating feedback", i.e. adaptive learning material that students to work out the necessary knowledge themselves.

The object of this task is the well-known translation of an algebraic expression into its geometric representation.

Answered AuthOMath Task
Figure: An answered AuthOMath task

Here, GeoGebra provides an interactive applet in both STACK's task and feedback area. The latter comes in three steps, each after some delay:

  • First, it allows the learner to compare her or his wrong solution with the correct, thus giving an experienced user immediate hints about his error, presumably made inadvertently.
  • For those needing more help, it provides an interactive version of the situation together with questions that guide the student through working out himself how the algebraic and geometrical representations of this function relate.
  • Finally, it gives access to a worked solution, thus serving those learners which rely on a stepwise instruction to solve questions like this.
First Feedback Step
Figure: The first feedback step in an answered AuthOMath task
Second Feedback Step
Figure: The second feedback step in an answered AuthOMath task
Third Feedback Step
Figure: The third feedback step in an answered AuthOMath task