"The four volumes of the Cambridge Grammar of Medieval and Early Modern Greek are the fruits of a large-scale and complex research project that began in 2004. It took much longer than originally planned, mainly because there proved to be even more surviving linguistic material than we had expected, but also because of the incredible richness and diversity of the language we were analysing. But perhaps the most important factor is that at every step we were encountering phenomena that had never before been explored systematically and in detail by linguistic researchers"--