How Pre-Service Teachers can be Supported to Increase their Diagnostic Skills in Mathematics -Design and Evaluation of a Learning Platform for University Teacher Training

Daniel Walter ^1* Andreas Bergmann ² Meike Böttcher ¹ Lara Huethorst ¹ Lea Reinartz ² Nina Grünewald ¹ Christoph Selter ¹ Andreas Georg Harrer ²

• ¹ Technical University Dortmund, Dortmund, Germany
• ² Dortmund University of Applied Sciences and Arts, Dortmund, North Rhine-Westphalia, Germany

One key training objective of pre-service teachers is to develop their diagnostic skills in order to enable them to support their students adequately. Digitally supported learning opportunities, such as learning platforms, are only rarely available and empirically researched for this purpose in the context of the primary school mathematics. This article describes the conception and evaluation of the digital learning platform FALEDIA. Researchers from different perspectives of mathematics education on the one hand and of computer science on the other report on design principles and concrete realizations which intend to support the needs of the targeted user group. In addition, an evaluation study with 695 preservice teachers from two universities provides insights into the effectiveness as well as into the preservice teachers' usage of the learning platform. It is shown that pre-service teachers -from first-year to experienced -achieved significant performance gains in terms of diagnostic skills through the learning platform. With regard to usage, it could be shown that the self-assessed learning style has only little effect on usage behavior.