“…Combining the works of Knight and Ellsberg, John Prpić summarized the key 99 differences between risk and uncertainty, and defined risk as a situation where the probability and 100 impact estimates of an event are objectively known, and the confidence in the quality of the 101 information used to construct these estimates is very high. He further defined uncertainty as a 102 situation where the probability and impact estimates of an event are subjectively determined, and 103 the confidence in the quality of information used to construct these estimates varies from low to high 104 [2]. But as the ISO definition points out, the crucial determinant in identifying uncertainty is its 105 potential to eventually lead to an effect on objectives, thereby causing a risk.…”