Some remarks about the strategy above: the last step is performed by deterministic fitting methods in the literature . Thus, if desired due to frequent use, deterministic tuning can be employed instead of the Bayesian approach. Another relevant point is the way that sensitivity analysis is applied here is not new, since that such analysis is commonly used to rank and determine the most relevant factors that affect model outcomes . However, in the context of CSP viscosity estimation, sensitivity analysis and clarification on which tuning parameters must be calibrated based only on model response to perturbations are unreported in the literature. Moreover, the determination of which CSP tuning parameters have to be subject to calibration reduces the size of parameter vector and improves the calibration procedure, decreasing computational time cost and increasing parameters' identifiability .