Based on a cooperative project between the Europe University Flensburg, the University of Koblenz-Landau and the University of Siegen (Germany) on the development of an open source electronic mathematical proof system (cf e-proof.weebly.com), a new project has evolved with a focus on primary education. The aim of this project is to support argumentation skills through the iconic and enactive visualization of reasoning processes. The focus is on supporting classical teaching and learning processes in primary education with digital learning environments. Grounded in the philosophy of pragmatism, Design Science research is performed for creating learning environments applying digital learning tools to support argumentation skills in primary school as artifacts. In this paper the first developed learning environment is presented and insights into the results of an empirical pilot study investigating the learning environment are given.