In this chapter we look at three ‘grammars’ of educational technology, or ways of using and thinking about education technology, that are informed by the advent of the internet: online mediated communities of practice, educational online multi-user role-play games, and connectivism. Each of these grammars has different strengths and weaknesses. Our critique leads us towards a new way of understanding the role of educational technology which we call a ‘dialogic’ grammar or a dialogic foundation for the design of educational technology.