An unusual method of construction, with many variations on the theme. Construction method, sizing and tension all well explained and your own interpretation encouraged. Patterns for each variation written out and summarized on schematic charts. Yarn requirements given in lengths, weight and thickness of yarn to assist with yarn substitution for each pattern. Only relatively basic knitting skills required. Beautiful pictures. I have enjoyed reading the book and although I am only halfway through knitting my first jacket I suspect it will not be my last.