How to encourage interns to speak up for sth they disagree?
Interns in my company seldom give their opinion, is there any method to encourage them?
Interns are new to the company or maybe workplace, it is normal for them to feel the hesitation to bring up their disagreement or opinion. What I would suggest is cultivate an warm and friendly working environment in the team. When they said something wrong, criticize them in a more gentle way. Other than that, make sure they are clear of the company's operation, so that they have the confidence to discover the problem and point it out.
Maybe you would want to ask them their thoughts directly, and listen with an open mind. Most interns don't speak up because they are afraid their ideas would get shot down if they do. Show that you are willing to listen, and put enough trust in them.