**2. Methods**

### **2.1 Goal and scope of the study**

The goal definition describes the purpose of the study and the decision process to which it provides environmental decision support [8], and the scope includes the way the object of investigation is modeled. The functional unit and system boundaries are also determined at this step. The scope definition of an LCA study must address the following issues:


Detailed issues (e.g., *functional unit*, *system boundaries*, *time scale of the study*, *technologies representing the different processes*) in scope definition of an LCA study is discussed by Hauschild and Barlaz [8].
