All the chapters of this book were co-authored by Marshall McLuhan and Robert K. Logan with the exception of 2015 Preface, Chapters 6 and 7 and Part 2 of Chapter 13, which were authored by Robert K. Logan in 2015. The original material co-authored by Marshall McLuhan and Robert K. Logan circa 1979 is presented unedited exactly as it was written then. However Robert K. Logan has inserted parenthetical remarks to this material to bring it up to date where necessary or to comment on the 1979 material from a 2015 perspective. These parenthetical remarks are encased in {curly brackets}.