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Computer simulation of electromagnetic field problems has become a key tool in dealing with EMC problems. In particular time domain algorithms are best suited, as they are able to deliver broad band results by their very nature in an easy way. There are several time domain approaches such as FDTD, TLM and FIT[3,4] that are commonly used. In EMC problems, there are often rather challenging geometrical structures that make a straightforward analysis very expensive, if not impossible. Thin slots in big boxes for instance, metallic grids with small holes, small electronic devices placed in a large airplane, or any other geometrical situation with a large contrast in spatial dimensions require the development of special local modelling. We will present the state of the art in dealing with EMC problems for realistic applications and demonstrate the superior efficiency of modern algorithms employing such special models.