Social Interaction, Constructivism and their Application within (CS)CL Theories. - Christian Hartmann 005; Jennifer Angersbach; Nikol Rummel (CSCL, 2015)

Communication Patterns and Their Role for Conceptual Knowledge Acquisition From Productive Failure. - Christian Hartmann 005; Nikol Rummel; Katharina Loibl (ICLS, 2016)

Examining Positive and Negative Interdependence in an Elementary School CSCL Setting. - Christian Hartmann 005; Jennifer K. Olsen 001; Charleen Brand; Vincent Aleven; Nikol Rummel (CSCL, 2017)

Using Example-based PF Conditions to Investigate Preparatory Effects of Problem-solving Prior to Instruction. - Christian Hartmann 005; Nikol Rummel; Tamara van Gog (ICLS, 2018)

Exploring Relevant Problem-Solving Processes in Learning from Productive Failure. - Charleen Brand; Christian Hartmann 005; Nikol Rummel (ICLS, 2018)

Using HeuristicsMiner to Analyze Problem-Solving Processes: Exemplary Use Case of a Productive-Failure Study. - Christian Hartmann 005; Nikol Rummel; Maria Bannert (J. Learn. Anal., 2022)

VRMeta-REG Tool to Support Student's Collaboration in Social VR. - Laura C. J. Pflieger; Christian Hartmann 005; Maria Bannert (ICAT-EGVE (Posters & Demos), 2023)

Imagine & immerse yourself: Does visuospatial imagery moderate learning in virtual reality? - Christian Hartmann 005; Younes Orli-Idrissi; Laura Claudia Johanna Pflieger; Maria Bannert (Comput. Educ., 2023)

Taking the Next Step with Generative Artificial Intelligence: The Transformative Role of Multimodal Large Language Models in Science Education. - Arne Bewersdorff; Christian Hartmann 005; Marie Hornberger; Kathrin Seßler; Maria Bannert; Enkelejda Kasneci; Gjergji Kasneci; Xiaoming Zhai; Claudia Nerdel (CoRR, 2024)

The Role of Enjoyment and Epistemic Emotions in Middle School AR Learning: A Quasi-Experimental Field Study. - Daniela Olea-Ibarra; Christian Hartmann 005; Maria Bannert (J. Comput. Assist. Learn., 2025)