I am aware this is only one of a collection of course books but for what it is, I think it lacked a consistent or well-planned anchor into what it wanted to cover.
Of the four sections here, the first two (on Expressionism and Cubism, if I recall correctly) were quite expansive and thus, interesting to read and examine. One would assume the remaining sections would be similar in scope but they only barely touched upon several key art movements and moments in avant-garde history, rendering the whole reading experience to be rather unsatisfying and a chore to get through.