Critters today are always on the go with projects in tow. With limited room in a tote bag, it's not easy to tote around reference materials, and unfortunately coming upon a problem in the middle or your child's soccer practice can bring everything to a halt. I feel this book is the perfect carry-along reference: compact and full of useful information for novice and advanced critter's alike. The diagrams are easy to understand and the explanations clear and concise. The book itself is sturdy, so will take lots of travel abuse. I found it to be quite useful.