The age structure was chosen based on other studies which showed and proved that there is a positive relationship between the waste generation and the percentage of the medium age group (Beigl et al., 2005; Lindh, 2003). In fact, all variables were chosen based on other studies which demonstrated that these variables are linked with waste generation and have a greater influence than others (Beigl et al., 2005; Ordonez-Ponce, 2004; Rimaityte et al., 2012). After we studied other research papers and selected the variables, the data collection process was performed. If for the first tool ( Waste Prognostic Tool) the variables were already fixed and required by the software, for the other one (Minitab) we have chosen from several variables those that provide results closer to the reality and certainly the same that we used for the first tool.