This paper argues that Cultural Historical Activity Theory (CHAT) provides a practical framework for theory-based research into Technology Enhanced Learning (TEL). Far from being inaccessible, CHAT provides researchers with the concepts, language and tools to create meaningful and manageable data sets that allow insights into complex social situations such as education. Within the context of a pre-university English language program at a Federal institution in the United Arab Emirates (UAE), the paper describes two recent examples of the author’s research into laptop-mediated English language classrooms using CHAT as the theoretical framework. The paper then goes on to describe a theory-based intervention currently in progress that has grown out of the two examples described. This paper aims to demonstrate that theory and practicality need not be separate. CHAT can be used to guide and design research into not only innovation and best practice in TEL but also the actual day-to-day realities of technology usage in real classroom settings, bringing much-needed criticality to the field. The paper concludes by arguing that CHAT can also provide a framework to drive theory-based interventions via the Change Laboratory. Through CHAT, findings from theory-based research need not remain at a conceptual level but can actually be used to create concrete solutions to problems and actual improved educational practice and policy. Keywords: activity theory; CHAT; English Second Language (ESL); English Language Teaching (ELT); Technology Enhanced Learning (TEL); laptops; classroom devices; Change Laboratory; United Arab Emirates (UAE)Part of the Special Issue Debating the status of ‘theory’ in technology enhanced learning research