The modelling of electromagnetic systems has become both feasible and affordable in the last twenty years.
This has been enabled by the increasing availability of powerful computing in addition to a number of software systems which enable, not only the solution of the physics of the interaction of electromagnetic fields with the geometry of concern, but also the modelling of that geometry.
There are still a number of challenges in the use and acceptance of the modelling of electromagnetic interactions, including validation, visualisation and assimilation of results and the modelling of diffusive materials and non-linearities.