A school's central purpose is that children should learn. Good behaviour makes effective teaching and learning possible. Bad behaviour disrupts these processes.
Behaviour in general is the response of an individual to a specific situation or set of circumstances or to certain stimuli. Discipline is the control on that response either by the individual itself or by a third party.
The three main influences on a child's behaviour are home, the school and the peer group. In some instances the home and school standards may be similar and in some cases they are in conflict. It is probable that the codes of the peer group are in conflict with the home and the school.
Reducing (and understanding) bad behaviour is a realistic aim. Eliminating it completely is not.
The overall tone of this behaviour policy is positive and will be consistent in its application to ensure that it is supportive of children's needs.