From my personal experience in the past as an intern: * Give the intern a well-defined task that takes finite time (e.g., 2 months). * Find out about the inter

From my personal experience in the past as an intern: * Give the intern a well-defined task that takes finite time (e.g., 2 months). * Find out about the intern's interests and try to hire someone who likes the languages / stacks / technology domain you are working in. * Check up regularly on the intern. It is very easy for an intern to lose his way and not ask questions / ask for help.