Good all-round book that gives a solid basis for understanding aromatherapy. Includes chapters on history, production, botanical families, chemistry, therapeutic usages of specific oils, with useful tables. A highly readable and useful book from one of the "grand old ladies" in the aromatherapy field. Beginners can benefit, but I think that the book is aimed at potential and practicing aromatherapists. Regarding the title, I thought that it meant a booklet where I could fill in the blanks, etc. However, her meaning seems to be a reference for people who are working with aromatherapy.