Compost Heaps versus Worm Farms...  

Can anyone clarify the difference between a compost heap and a worm far? I have read material on worm farms which often seems to imply that the worm farms just live in a compost heap, but by my understanding, a compost heap decomposes organic materials by an exothermic bacteriological process which would kill any worms trying to start a family in it. So it appears to me that the two structures, a worm farm and a compost heap, serve pretty much the same function, but use entirely different organisms to accomplish the task and are completely incompatible with each other. But it would help a lot to have the advice of people who have experience in managing both types of organic processing.