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A risk assessment is always based on a number of assumptions and boundary conditions. The most notable is the system boundary that specifies which parts of the system that are included in the study object and which parts are not. All systems are used in some sort of environment that may influence and be influenced by the system. To delimit the study object, a system boundary is established to define what is inside and what is outside of the system. The inputs to and outputs from the study object are drawn up, as shown in Figure 4.2 . The system boundary may be defined as follows: