## 2 Materials and Methods
### Definition of New Integrated LCA+C2C Categories
It is the result of the global cause-effect weighting. The unit of measurement coincides with \(\rm N_{K}\) and depends on the reference method used. * \(\rm N_{K}\) is the total normalized impact value for a \(\rm Q_{K}\) category. The unit of measurement depends on the reference method used. * \(\rm\alpha_{ijk}\) is the weighting factor in the LCA+C2C endpoint method; it is dimensionless. * \(\rm w_{ijk}\) is the weighting result for an LCA+C2C endpoint category. The unit of measurement is LiC eq. * \(\rm R_{JK}\) is the endpoint impact generated by each type of resource (land, materials, energy, water, human and information). It is the result of the partial weighting derived from the inputs. The unit of measurement coincides with \(\rm N_{K}\) and depends on the reference method used. * \(\rm W_{R}\) is the index of the quality of inputs (resources used)--the limits are 0\(\leq\)\(\rm W_{R}\leq 1\), where 1 is the total quality of the resource (or zero impact). The unit of measurement is LiC eq. * \(\rm W_{K}\) is the index of the quality level of the protected elements (human, biotic ecosystem and abiotic ecosystem)--the limits are 0 \(\leq\)\(\rm W_{K}\leq 1\), where 1 is the total quality (or zero impact on the protected element). The unit of measurement is LiC eq. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \(\rm J_{K}\) & \(\rm I_{jk}\) & & & \(\rm K\) \\ \multicolumn{2}{c}{**Causes**} & \multicolumn{2}{c}{**Effects**} & & **Damage (Protected Areas)** \\ \hline \multicolumn{2}{c}{**Resources**} & \multirow{2}{*}{**Midpoint Category**} & \(\rm C_{i}\) [unit/\(\rm N_{i}\) [unit]]** & \multirow{2}{*}{**Type**} & \(\rm\alpha_{ijk}\) & **LCA+C2C Endpoint Category (\(\rm Q_{k}\))** \\ \hline \multicolumn{2}{c}{} & Global warming & \(\rm Kg\) CO\({}_{2}\) eq/unit & En & 0.19 \\ \cline{2-5} \multirow{5}{*}{Materials (M)} & Ozone depletion & \(\rm Kg\) CFC-11 eq/unit & En & 0.08 \\ \cline{2-5}  & Human toxicity & \(\rm Kg\) 1.4-DB eq/unit & En & 0.39 \\ \cline{2-5}  & Particulate matter formation & \(\rm Kg\) PM10 eq/unit & En & 0.08 \\ \cline{2-5}  & Photochemical oxidation potential (SMOG) & \(\rm Kg\) C\({}_{2}\)H\({}_{4}\) eq/unit & En & 0.14 \\ \cline{2-5}  & Ionizing radiation & \(\rm Kg\) U\({}_{235}\) eq/unit & En & 0.12 \\ \hline \multirow{5}{*}{Energy (E)} & Global warming & \(\rm kg\) CO\({}_{2}\) eq/unit & En & 0.50 \\ \cline{2-5}  & Particulate matter formation & \(\rm Kg\) PM10 eq/unit & En & 0.25 \\ \cline{1-1} \cline{2-5}  & Photochemical oxidation potential (SMOG) & \(\rm Kg\) C\({}_{2}\)H\({}_{4}\) eq/unit & En & 0.25 \\ \hline Human (H) & Human ecotoxicity & \(\rm kg\) 1.4-DB eq/unit & En & 1.00 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Data, relationships and indicators for impact category calculation. * **Group III or improvement categories**: Set of global sustainable performance indicators. These analyze and establish the strategies for the Continuous Improvement Plan (CIP), which includes the product redesign proposals. This group provides a single life cycle assessment score as an index of the environmental, economic and social footprint. The results are compiled in the Future Effects Inventory (FEI). In order to analyze the product's CIP in one period, and to be able to propose the modification strategies in the next redesign, all the FEI macro-indicators must be analyzed with expressions (6) and (7). Specifically, IP% provides the improvement ratio between two product generations; it evaluates the CIP in two consecutive periods. On the other hand, IP\({}_{\text{T}}\) analyzes the trend of change in successive product generations, or, in other words, the evolution of the product's sustainable performance from the initial implementation (launch