We have an awesome teacher for the building of DDC (Dewey Decimal Classification) who shall herafter be referred to as 'Awesome Library Teacher 1' (or ALT1) - and yes, there is actually an ALT2, in case you were wondering. The conversation that validated her - ALT1 - awesomeness ran like this:
Also, if you were looking for a book about the effects of leaf beetles on maple forests, would you look animal pests or insect pests?
Student: ALT1, can we just use the index to build the number for question
ALT1: I can't answer that. My valium hasn't kicked in yet.