School bullying  School bullying is a type of bullying, that occurs in any educational setting. For an act to be considered bullying, it must meet certain criteria. This includes hostile intent, imbalance of power, repetition, distress, and provocation. Bullying can have a wide spectrum of effects on a student, including anger, depression, stress, and suicide. Additionally, the bully can develop different social disorders, or have a higher chance of engaging in criminal activity. If there is suspicion that a child is being bullied or is a bully, there are warning signs in their behavior. There are many programs and organizations worldwide which provide bullying prevention services and information on how children can cope if they have been bullied. It is widely agreed that bullying is a subcategory of aggressive behavior characterized by the following three minimum criteria:  The following two additional criteria have been proposed to complement the above-mentioned criteria:  Some of these characteristics have been disputed (e.g., for power imbalance: bullies and victims often report that conflicts occur between two equals); nevertheless, they remain widely established in the scientific literature. Bullying can threaten students' physical and emotional safety at school and can negatively impact their ability to learn. The best way to address bullying is to stop it before it starts. There are many different groups that can intervene to address bullying (and cyberbullying) in schools: parents, teachers, and school leadership. The most commonly used strategies by teachers to prevent it are to communicate, mediate and seek help. Training school staff and students to prevent and address bullying can help sustain bullying prevention efforts over time. There are no federal mandates for bullying curricula or staff training. In addition to addressing bullying before it occurs, a great prevention strategy is to educate the students on bullying. Examples of activities to teach about bullying include:   Multicomponent programs which have multiple practices to address the various internal and external factors of bullying and which involve all students and parents in each class are effective to prevent bullying. It is required that such programs are implemented at all schools in each country. A victim, in the short term, may feel depressed, anxious, angry, have excessive stress, learned helplessness, feel as though their life has fallen apart, have a significant drop in school performance, or may commit suicide (bullycide). In the long term, they may feel insecure, lack trust, exhibit extreme sensitivity (hypervigilant), develop a mental illness such as psychopathy, avoidant personality disorder or PTSD, or develop further health challenges. They may also desire vengeance, sometimes leading them to torment others in return.