The Trialogical Learning Approach is an approach that focuses on the way a group of people create and modify “conceptual artefacts” (all kinds of texts, project plans, models, sketches are conceptual artefacts, not just the ideas; and the trialogical learning aims at finding ways of helping people to organize their work and learning around these artefacts) with the help of a technology-supported learning environment developed specifically for that purpose. This handbook is devoted to introducing the basic characteristic of the trialogical way of organizing learning activities for students.