Tens sounds a lot like tense, and tense is how AutoCAD may make you feel sometimes. Tens also may remind you of the metric system, and if you're not used to it, that may also make you feel tense. But never fear — help is on the way! A Top Ten List is a good way to quickly spot the best — or the worst — of almost anything, AutoCAD included. This Part of Tens features lists that help you understand some of the nuts and bolts that make AutoCAD work, figure out whether you should be using AutoCAD or AutoCAD LT, and hunt for the most valuable AutoCAD resources.