The finder is really easy to follow, and uses simple guidelines based primarily on leaf shape, placement, etc. The system is logical, and easy to use. Sometimes the illustrations can be misleading (it's easy to do maples, sassafras, and sweetgum, but oaks were trickier because of the illustrations and the many trees that have very similar leaves are really hard). Overall, however, it's a great system. It could use a little more information, but for a guide that easily fits in your purse, it's magic. ( )