What is your philosophy about the best way to get other people to work their hardest?

There are Several aspects to this question. One has to do with what you think the basic nature of humans is. Are they lazy or hardworking? Another has to do with whether you can trust people to do their jobs well, or if you have to constantly watch over them to make sure they are working and not making mistakes. Still another has to do with whether you think hard work is always associated with the highest level of productivity. Finally, I’d like to know what specific techniques you believe are necessary to get people to work their hardest and most productively.