We present, as a case study, the web-based platform Levumi that enables teachers to easily monitor learning
progressions of children with a focus on elementary skills in reading, writing, and mathematics. Curriculumbased
measurements are used that can be administered economically in short time and - in many parts - in
parallel for multiple children. The system is built around exchanging data between schools and educational
research, such that data with high ecological validity can be collected anonymously in order to gain insights
into learning processes and in turn offer improved tests for teachers. For this case study, the acceptance and
use of the platform over the last years is evaluated with a focus on tests for reading abilities. The results show
how that many users are integrating the system in their daily teaching, learning progressions can be assessed
and that the data is even usable for validation purposes.