Opinions on Future Research Themes for Technology-Enhanced Learning: A Delphi Study. - Christine Plesch; Malte Jansen; Anne Deiglmayr; Nikol Rummel; Hans Spada; Nina Heinze; Ulrike Cress (ICCE, 2010)

Emerging Tensions in the Future of Technology-Enhanced Learning: First Results of an International Delphi Study. - Celia Kaendler; Christine Plesch; Anne Deiglmayr; Dejana Mullins; Nikol Rummel; Hans Spada (CSCL, 2011)

Identifying Areas of Tension in the field of technology-enhanced learning: Results of an international Delphi study. - Christine Plesch; Celia Kaendler; Nikol Rummel; Michael Wiedmann; Hans Spada (Comput. Educ., 2013)