Robert Browning’s Medieval and Modern Greek is a survey of the changes that the Greek language went through after the classical variety of the 5th century BC, written with the assumption that the reader already has a thorough grounding in Classical Greek. The book was first published in 1969 by Hutchinson, but in 1983 a second edition was published by Cambridge University Press to represent the outcome of the great changes of the previous decade, which saw the artificial literary norm Katharevousa finally dismissed in all spheres of activity in favour of a standard language closer to Demotic, or popular, Greek.
So Browning proceeds chronologically, noting when classical constructions fell out of use or innovative formation arose. He ascribes the major pronunciation changes to earliest times, and after that his comments are mainly on morphology and lexicon. This presentation of the post-classical Greek language is divided into 6 periods: the Hellenistic world and the Roman empire, the early middle ages (from the 6th century to 1100), the late middle ages (1100–1453), the period of the Turkish occupation, and finally the development of the modern language. In the last chapter there is a quite detail survey of the dialects of Modern Greek. Following the text is an enormous bibliography and an index of Greek words mentioned in the text.
My only complaint is the lack of a topical index or some clearer outline, so that one could more quickly look up information. Each chapter presents the developments of the era in one steady flow without section headings. Still, as a graduate in Classics who would like to learn how to communicate with the Greeks of today, I found Browning's book very useful in explaining just how some of these strange new forms in my Modern Greek textbooks came about.