this is recommended when the calibration and validation are very time consuming because the model is very complex or because the number of observations is high.
The fifth stage of the workshop encompasses the testing of various selected scenarios and their conclusions. The simulated scenarios are made after the calibration and validation and may be carried out after the workshop has been reconvened. The model is foreseen to be adaptive,because if the basic conditions for the model have been changed (we are living in a dynamic world), the model should be changed correspondingly.A follow-up workshop should be agreed upon during this stage.
The follow-up workshop, perhaps one to three years after the first workshop, should adjust the model according to the observed “mistakes” by the model and the changing basic conditions. To what extent the previous conclusions should be changed also needs to be discussed.
During the follow-up workshop it is recommended to examine whether the IMM has been a success or failure. This can be determined by answering the following questions (see van den Belt, 2004):