Based on this assessment and the decision rule, a management decision is made (e.g., annual or multiyear TACs). Fleet effort and catch are then modelled, potentially allowing for error in implementation, and resulting catches are fed into the operating model. By repeating this cycle the full management cycle is modelled. Alternative decision rules can be compared by running many stochastic simulations for several years to identify the performance of a decision rule according to different metrics under the likely range of conditions.