The paper concludes that the performance of routing algorithms that are not designed specifically to take imprecision into account degrades significantly as the imprecision grows. Most QoS routing algorithms available today do not take this uncertainty into account. Instead, they assume it does not exist, regardless of the inherent nature of this uncertainty. However, research has been done to evaluate the impact of neglecting this uncertainty on the performance of different routing algorithms. In addition, few routing algorithms have been proposed with the main objective of handling the intrinsic imprecision and reducing its effect.