Methods for model optimisation based upon the criterion of the model output fitting the tomographic image.   The problems that we anticipate are:
• How do we characterise the behaviour of a physical model? 
• How do we select the model input parameters to generate a representative sample of solutions?
• How to deal with global/local minima? 
• Once we have found a model run that matches the tomographic image (in fact a tomographic movie) how unique is that model solution? 
• Do those model inputs really represent reality?  Is the knowledge of the physics behind the  model adequate?  If not can we identify its lack and improve it?
Model-image coupling