I do so agree with Gemma!
The lace charts are easy enough to follow; but the twist and cable ones are very confusing and difficult. Sometimes there are explanations to particular symbols next to the patterns in which they occur, which are different to the explanations given at the back of the book. Some symbols are not explained anywhere in the book. What DOES a 'V' with a dot inside it mean??? And the symbols are not standard ones so you can't get help elsewhere. I've found what appear to be several mistakes. And some of the twist patterns are several squares wide with component squares which could be read individually. So your first task is working out just which of the squares are meant to be read together as one composite symbol. They don't seem to bear any relation to their separate meaning.
The authors have followed the aim of getting the pattern to look as far as possible like the final piece of knitting (not entirely necessary as there are excellent swatch photographs). This causes further confusion as you have for knit and purl a blank square and a square with a large black dot, respectively. That's on a knit row. But in order to get, for example, a moss stitch row to look like moss stitch, these symbols mean the opposite when doing a wrong side row. The only way to deal with it, i found, was to make an enlarged photocopy of the chart (it can't be against copyright when the book actually suggests you do this) and colour all the knit stitches in one colour with a hi-lighter, and all the purl stitches with another colour. I then picked out all the double square stitches of each kind with a colour each and made my own shorthand for what they meant in the margin. Finally the chart became readable but I did feel I was doing the equivalent of writing the letter names onto stickers and fixing them to the keys of a piano and on the notes of the music rather than learning to read it properly!
I'd also like to know WHY I am knitting things in a particular way. Why does this book like me to twist so many of my stitches by knitting into the backs of loops? And why am I slipping stitches along the lower edge of each entrelac diamond? I've found a reason to do this on the top side, but the book directs you to do it at the bottom. Why? Without adequate explanation you are not growing in expertise, just learning to follow blindly.
Having said all that, I must say that for a long while I was thrilled with the book. It was only when I ventured into different areas that these things came to light. It covers a wide range of stitches in several different categories (although no slip stitch patterns, sadly). And they are beautifully presented.