Introduction. Wikis have made it possible that people from all over the world jointly participate in constructing knowledge. Objective. This article explores the relation between wiki technology and an on-line collaborative writing of a Basic Primary School group of students of several institutions in Medellin city, Colombia. Materials and Methods. Sixty-three (63) fifth-level students from three official education institutions, not related among them, participated. A qualitative design, with an exploratory scope was used. Most of information sources were semi-structured interviews and registry of on-line interactions. Results. Results show that a pedagogical accompaniment may be an interesting supporting resource for on-line collaborative writing. Conclusion. Digital technologies may ease to start up some pedagogical ideas associated to collaborative writing; however, research should continue to corroborate if this type of exercises may be repeated in several contexts and avoid falling in technological determinism.