Paavola , S., Lakkala , M., Muukkonen , H., Kosonen , K. and Karlgren , K. 2011. The roles and uses of design principles for developing the trialogical approach on learning. Research in Learning Technology. 19, 3 (Nov. 2011). DOI:https://doi.org/10.3402/rlt.v19i3.17112.