iDTV is a promising platform for education, since it can reach a large number of people and provide computing and communication interactivity. However, a number of key issues have yet to be faced, in a variety of fields, such as pedagogy, digital signal processing, and Human-Computer Interaction. Starting from pedagogical principles rooted in the constructionism theory, the ELU IST project presents a t-learning framework where learners are involved in compelling educational games through iDTV and engaged in their actual construction as well. Keywords: iDTV, constructionism, t-learning, MHP, gaming.