It is extraordinarily comprehensive, covering neurophysiology, EEG electronics, protocols, brain theories, neurofeedback models and strategies for working with different populations.  Michael and Lynda Thompson have created what is sure to become universally considered the "bible" of the field-- the best book on neurofeedback to date. They deserve the kudos and appreciation of the members of the field, and the close attention and gratitude of newcomers just entering the field.