Sensitivity in this research refers to how much rework (measured in additional time) is required on the downstream activity if upstream information changes. This relationship is illustrated in Fig. 4 where the horizontal axis refers to the extent that upstream information is changed. Therefore a highly sensitive activity would require a large amount of rework if a piece of input information changed just a small amount. An activity with low sensitivity can sustain large changes in input information with only minimal rework. This definition of sensitivity is consistent with the definition developed by Krishnan et al. (1997).