*4.4. Sensitivity Analysis*

#### 4.4.1. Setting Major Variables for Sensitivity Analysis

Among the assumptions and variables previously established, sensitivity analysis was performed on the variables expected to have a significant influence or variables that must be considered for the future commercialization of GEWPro. The three significant variables finally selected for performing sensitivity analysis were (1) work time of each work process in the automated method by GEWPro (preparation and installation work, painting work, disassembly and horizontal moving work); (2) projected expenses of GEWPro equipment (initial cost of GEWPro, maintenance cost of GEWPro); and (3) interest rate. The sensitivity ranges for each variable in performing sensitivity analysis were established, as shown in Table 8.


**Table 8.** Setting ranges of the significant variables for sensitivity analysis.
