In reviewing the included studies, it becomes clear that educational technology is not a single homogenous intervention but a broad variety of modalities, tools, and strategies for influencing and assisting teaching and learning. The different forms of educational technologies included in this mapping are, in addition, used in a variety of educational contexts, and with a wide range of goals. The inherent heterogeneity of the material therefore makes it difficult to draw clear conclusions concerning the effectiveness of ICT in education.
Morgan, K., Morgan, M., Johansson, L., & Ruud, E. (2016). A systematic mapping of the effects of ICT on learning outcomes.