The World Health Organization released the report, "What works to prevent online violence against children?", which presents ways to address the growing worldwide concern of keeping children safe online, with a specific focus on two forms of online violence: child sexual abuse including grooming and sexual image abuse; and cyber aggression and harassment in the form of cyberbullying, cyberstalking, hacking and identity theft. The report recommends implementing school-based educational programs that have multiple sessions, promote interaction among youth and engage parents.