In addition, using the current weights for the aggregate cost function, data points derived from the same intervention policies can be clustered and grouped together (shown in figure 6 as dashed circles). This suggests that, based on the current priorities given to the cost components, intervention policies are the dominating factors in mitigating an influenza pandemic. It should be noted that, in particular, prophylaxis policies guided by contact tracing have stronger effects on reducing the total attack rate (lower right quadrant in figure 6 ). Within each intervention policy, the different diagnostic methods then fine-tune the allocation of limited resources.