Teachers, students and schools are object of characterization to try to understand how digital competence is achieved, in what it manifests and what implications it has. This article addresses the frequent absence of children's point of view as qualified informants in childhood and ICT research. To justify the inclusion of these voices in the study of issues that affect them, epistemological reasons, communicational differences between adults and children, and children's rights that determine a particular research ethic are proposed. It is asked about the adequacy of the tools to obtain the child perspective and the technical resources used to face it are illustrated. The study methodology reviews a battery of studies within an international investigation that has attempted to include these techniques. Specifically, a variation of the game box technique, which is replaced by a laptop, and the contribution of student diaries in characterizing practices with technology are analyzed. Among the results, it is observed that specific techniques are required to support the specificity of children's speech. In this regard, the techniques used allow characterizing children's production with technology. On the other hand, in the face of theorizing by adults about student productions, these techniques allow to overcome the interpretation bias that an adult-centered discourse has. In any case, it is necessary to triangulate the results with other tests