One thing that we have usually seen when walking pass a playground is a group of people on playground. A group is composed of parents and kids. In playground, there are social interactions and communication among people. As a result, it induces a social process which can be characterized by the three followings:
1.1 Social contact-referred to as acts, actions and practices of two or more people communicating mutually.
1.2 Emotional and cognitive opinion is interchanged between people through either verbally or non-verbally symbols or even in written forms.
1.3 Simulation and response are the result of social contact, emotional and cognitive perception and exchange.