Youth violence remains an important topic in urban sociology and sociologists seek explanation to investigate the link between space and action. Furthermore, youth violence is associated with disorganized communities and risky neighborhoods as well as to individual socio-demographic factors. However, the scope of this chapter is on the interplay between individual norms and influences of risky neighborhoods. Therefore, literature about violence-related norms and the code of the street, as a specific concept, which takes the social and spatial environment into account, is reviewed. The goal is to formulate empirical markers of the code of the street, for use in the empirical section of the study. 3.1 Violence and Norms: An Overview Before discussing the basic conceptual assumption of violence-related norms, three important terms need a definition. 1 1. Violence is defined as the "exertion of physical force so as to injure or abuse" (Merriam-Webster 2018). The World Health Organization (2016) provides a comprehensive definition of violence: "the intentional use of physical force or power, threatened or actual, against oneself, another person, or against a group or community, that either results in or has a high likelihood of resulting in injury, death, psychological harm, maldevelopment or deprivation." 2. Youth is defined as "the period between childhood and adulthood" (Oxford Dictionary 2018). However, the term youth is used variably in various context. In sociology, youth is defined as a social construct instead of a biological category (Kehily 2007: 03). The UN defines youth as individuals whose age range between 1 The concept, "norms", has been defined in Chap. 2.