The frontispiece to Cuban's (1986) book "Teachers and Machines" depicts a geography lesson being conducted in a 1930s aeroplane. The picture is engaging because it reminds us how easily a new technology can be thought to have a place in educational practice. Yet, Cuban argues, teachers have typically been reluctant to embrace these apparent opportunities. Sometimes, perhaps, we must be thankful: powered flight did not come to figure as a significant curriculum experience. However, the picture is also a warning that where new technologies are adopted, their role can turn out merely to consolidate existing practice rather than transform it: the airborne geography teacher is shown pointing to a display board, while rows of pupil/passengers passively look on. Cuban's thesis supposes that this pattern will be the fate of all new "machines" appropriated into education.But that was 1986. Commentators today might argue that, as an attractive and empowering technology, the digital computer is something very different from powered flight, movies, radio, television, slide projectors and so on. This is because the modern computer does not appear to be such a singular thing. The device that digitally records student performance in a drama class may be the same device that presents geology students with an earthquake simulation or offers history students an e-portfolio. Accordingly, when agendas are constructed for "teachers and (digital) machines," the versatility of this technology may set higher expectations for both its uptake and its potential for transformative impact. When such expectations are then made topics of research, attention will focus on how schools and universities respond to the opportunities residing in their digital infrastructure: ie, the various ways that they realise the generic potential of digital devices, networking and shared software. Most of the papers assembled in this Special Issue of BJET describe work in contexts where such "opportunities-of-infrastructure" should have existed. In other words, they report on sites of teaching and learning that are sometimes termed adequately "e-mature." The concern of this research will then be with how readily-and in what manner-a given application of the technology available is actually embraced.There is some urgency on these issues and, therefore, on the questions raised in the papers that follow. In developed economies, educational investment in digital infrastructure has been considerable. It is important to determine whether this investment has been effective, or whether it should be directed differently-eg, towards real estate, human capital, or other forms of resource supporting the cognitive, emotional and personal growth of students. So far, studies of how system-wide digital infrastructures shape educational outcomes have produced discouraging results. The OECD (2016) reviewed outcomes from a number of "natural experiments" whereby the performance of schools with policies of greater versus lesser digital resource investment were compared. They concl...