1. Slowly letting out the clutch to make the downshift smooth: Most uneducated riders handle things this way, but it requires tremendous concentration. 2. Changing gears once the bike is stopped: Even the best transmissions can be sticky. 3. Changing gear after braking is completed: This often means doing it in a corner, which is distracting and can upset the bike-to say nothing of the rider. 4. Alternately going from the brake to the gas to match revs: This makes the bike pogo at the front. 5. Downshifting before braking: This is fine for relaxed riding situations at slow speeds, but is hazardous to the engine if the rider is in "spirited" mode because it provides the opportunity to over-rev the engine. And in an emergency, you don't have time to do this. Some emergencies require you to brake and then get on the gas right away to avoid things like cars. 6. Forget it entirely and just roll through the corner: This forces a downshift at the corner exit, when you should be rolling on the throttle, ruining your drive. It's distracting and not smooth at all.