Before revision:  Most of the existing literature focuses on providing inferences on the mean output response with respect to input uncertainty , including point estimation and confidence interval construction of the mean response. However, risk assessment of the mean response with respect to input uncertainty often plays an important role in system evaluation /controlbecause it quantifies the behavior of the mean response under extreme input models.
After revision:  Most of the existing literature focuses on providing inferences on the mean output response with respect to input uncertainty , including point estimation and confidence interval construction . Risk quantification of mean response under input uncertainty often plays an important role in system evaluation /controlbecause it quantifies the behavior of the mean response under extreme input models.