Amazing amazing amazing spot on to the point in detail no messing up to date book. I would say essential for anyone undertaking a degree in complementary therapy in clinical practice as I did or any aromatherapy course dealing with in depth studies and elements of each oil. I would not say this book is ideal for nvq level 1 , or 2 possibly 3 also as they tend not to go into the detail this book gives. I would defiantly say the hardcore aromatherapists would appreciate this and deco use it rather than top middle and low notes as in some studies. Don't be mistaken this book can and will help any level but I would say the higher grade course your in the better value for money you will get out of this. I love it and will never part.