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The prediction of the radiated electromagnetic field from printed circuit boards and/or parts of electronic systems is dealt with by more and more publications in the recent literature. Numerical techniques such as the method of moments are applied to solve complex mathematical expressions. Such algorithms are nowadays in use e.g. for performing pre-compliance examinations by analysing the emission of electromagnetic fields generated by all clock lines of a printed circuit board. For this purpose, the algorithms used must be able to account for the exact layout geometry including any neighbouring metallised structures which influence the overall radiation characteristics. It has been shown that for simple structures good compliance of simulation and measurement results can be achieved. But it is still in discussion whether these tools are able to analyse real examples of higher complexity without losing a significant part of their quality and exactness. Fortunately, the experience of EMI/EMC-engineer's suggests that more than 90% of the EMI-problems are caused by fewer than 10% of the circuits. It is shown that by identifying and addressing these critical circuits, many EMI problems can be prevented or solved. (5 pages)