Engineering at the expert level breaks into two disciplines: gnome and goblin.  Gnome engineering represents by far the superior of the two!  It's about the construction of wonderful gadgets and devices that make life better!$B$B$N, read this manual.  If you want to learn more on gnome engineering, then take that manual to Tinkmaster Overspark in Ironforge.   Remember - membership is permanent and prevents joining the other discipline, so make sure you are sure before finishing his task!