This paper explores the role played by communication technologies and study orientations in the amplification and reduction of transactional distance in blended learning. Factor analysis and structural equation modelling of different communication modes (face to face, email and telephone) revealed that students experience at least some transactional distance when separated from their tutors. Email was found to facilitate the highest levels of immediacy of dialogue for most students. The conclusion is that strategic students are best placed to benefit from blended learning, and that the effects of transactional distance could be analysed more deeply if two subvariables of dialogue were recognised. These are social presence (the perception of connectedness between students and their tutors) and immediacy (the temporal effects of dialogue). (Contains 2 tables and 3 figures.)