This article explores the contribution of theory to understanding the take-up of information and communications technology (ICT) and, in particular, it describes how Valsiner's three zones framework came to be used in a study of lecturers in Saudi higher education institutions. The article describes the value of theory and, in the process, illustrates some of the approaches taken in the literature on teachers' use of ICT. The challenges faced in theorising are also covered. The article then goes on to give the background to a study of ICT use among university lecturers before moving to a discussion of methodology and presentation of key findings. Next, attention shifts to explaining key aspects of Valsiner's zones framework and showing how this framework was applied to explain the modest but differentiated use of ICT across eight institutions. Finally, the article discusses the strengths and limitations of the zones framework and highlights some of the wider challenges which theorisation poses.