Knowledge Management (KM) Definitions. Defining knowledge management (KM) has always been a challenge. For many years I resisted offering a definition because whenever I included a definition in a talk this would become the main focus of attention.
Motherboards can go bad for many reasons, although there are a few common culprits. Among the most common causes of motherboard failure are excess electrical shocks, physical damage, or excess heat. Some of these dangers are inescapable, and may vary in likelihood depending on your computer model.
Motors: main failure modes are failed bearings (seized) and broken wires. You occasionally see magnets coming loose, but that's rare. If you inspect your motors regularly, you will notice failing bearings long before they seize. It's very rare to have a multicopter fall out of the sky due to a motor failure. ESCs: if you use reasonable quality ESCs, and use them below 60% of their rated maximum, they basically don't fail. Props: they break, a lot.