Aggression, the quality of anger and determination that makes one ready to hurt people is one of the very common characteristics of human behavior. This pattern of behavior is widely learned and often seen imitated by children during the pre-school age. A child is to be manifested to transform his behavior to a socially acceptable manner. Psychologists of different theoretical persuasions have some basic disagreement about how to define aggression. Aggression is a behavior that deliberately make one feel frightened and hurt. It may be physical attack (hitting, kicking or biting), abusing (yelling, calling offensive nicknames and making derogatory remarks) or violations (e.g. snatching). It refers to observational behavior. A weakness is that it includes many behaviors that would not ordinarily consider aggressive. Aggression can be defined as a behavior that intended to deliberately harm others. This definition takes into account the intentions of the doer, but it may be less objective, for it involves inferences about intentions. Furthermore, it excludes some behavior that would normally be called aggressive. A child who drags out another from his swing as he/she wants to enjoy the same may not intent to hurt the other, but this behavior is generally remarked aggressive. Deliberate hostile attitude is defined as aggression as well.