Still relevent 25 years after publication. The references to typewriters are dated. This was written before the market changed to word processors as the only useful way to write something. The typewritter was still a viable tool to finish a manuscript when this was published in 1985.
One chapter in the book describes writing as "self training". The same chapter also has an essay from 1826 by Lugwig Borne that was the inspiration for psychoanalysis.
This short book was based on seminars the author performed on creative writing. One of the best snippits of the book was on concept vs. experience. It is better to write from experience not concept.
Concept: He commited suicide.
Experience: The rope was tied in a knot and the body was dangling, lifeless from the ceiling. In the cold bedroom...