Instruct: Classify a given review as either positive or negative.
Query: Tree Finder - it does just that!

I have successfully used the Tree Finder with students as young as 3rd grade (with some help). My 6th grade classes and high school classes were able to use it independently. Its' simple, straightforward approach is a fantastic introduction to using a key. The diagrams are a big help for the student unfamiliar with the vocabulary. The only weakness is that it doesn't cover some cultivated varieties, ie. thornless, so some coaching is necessary when using in a typical park or residential setting.