According to the obtained results of Tables 1-12, comparing the performance of the proposed sampling schemes by the statistical measures indicates that the VSSI sampling scheme, like Shojaie-Navokh et al. [15] which performed better in reducing costs, here too, has better accuracy and performance in reducing the statistical measures. Although, the VSS and VSI schemes have weaker performance than the VSSI scheme but used them compared to the FSSI scheme reduce statistical measures. The results demonstrate that a small change in the design of U control chart and sampling scheme increases the sensitivity to shifts and performance of the process.