Well, Dannihilator, there is also the:
-Aligning hub and axle so that the chain is kept straight
-Aligning the brakes to move and pinch at the right time and distance
-Setting the distance bolts in the drop out (Can't live without them)
-The usage of not using a chain tensioner (I don't, my bike is set up that way)
-the thoughts between 3/16th or 1/8 inch chains and gear fitting
-The Fixie set up so someone doesn't die or get their legs ripped off