The previous studies were relatively failed to identify multiple types of actions that individual engage in during the process of creating social interaction as an important aim of providing a healthy built environment. Based on individuals” location and the type of their presence in the built environment, this study suggests classifying individuals” actions into four typologies. In addition, two categories of social interaction are introduced regarding the types of individual” actions. The proposed typology allow researchers to better consider and classify the effective factors in the social interaction process in a built environment.