Models in the whatIf? Modelling Platform are organized through modelbases, model families and frameworks. They are described as follows:

• Modelbase - contains a collection of independent model families. Any other comments on what organizational benefit/function the modelbase provides?
• Model family - a model family contains the logic and all associated scenario and historical data for a particular model.
• Framework - a model family typically contains two frameworks - one for future simulation (simulation framework) and another for historical calibration (calibration framework). It is possible for a model family to have just a simulation framework .

A sample hierarchy is shown below:

modelbase
  model family 1
    simulator framework
    calibrator framework
  model family 2
    simulator framework
    calibrator framework
  model family 3
    simulator framework