In summary, a teenager's development can be affected by these four factors. For us, we think that friends play the biggest part for the influence of a teenager's development. Friends can change one's mindset, in relation to the factors of peer pressure and the encouragement to do and engage in new activities. Family also plays a part in influencing, it is the basis of cognitive thoughts and manners. Virtual society and school also influence a teenger's development in some ways. For example, the virtual society can provide one with new information, news, and opinions. School has discipline, with the possibility of new relationships and learning.
