The term bullying refers to intentional agressive actions and behaviour, carried out by one single person or by a group of people who deliberately intend to hurt or damage a peer who cannot easily defend himself and which happen repeatedly in time, extending over weeks, at times months or years.

Bullying can assume the following forms:

• PHYSICAL: punching or kicking, appropriating or damaging other people's belongings;
• VERBAL: ridiculing, insulting, repeatedly mocking someone, making racist remarks;
• RELAZIONAL: leaving out one or more peers from aggregation groups;
• INDIRECT: spreading irritating gossip about a student.

(Björkqvist ,1992; Olweus, 1993; Crick, 1995; Underwood, 2002; Monks & Smith, 2006; Smith, 2007)

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