How do you encourage your children to speak up? when he/she is being bullied in school?

Establish an open communication with your child even before he goes to school so when he's exposed to other people, he knows how to handle himself and he can open up to you in case something comes up. Here are some tips on how to deal with School Bullying: http://www.parents.com/kids/problems/bullying/how-to-deal-with-school-bullies/