A little disappointing. I really enjoyed the introduction, which was clearly and intelligently written, offering some useful historical material. However, I found the rest of the content rather poorly organised, perhaps in need of further editing, in terms of spacing, headings, bolding, and so on ... a frequently-found hazard with digital books. Being a summary, the ideas often seemed a little disconnected, which is inevitable, but this could have been improved by better formatting. Still worth a look, though.