Until quite recently, all the work towards being able to achieve EMC compliance with functional safety standards, for IET guidance and IEC standardization, assumed that it would be the responsibility of EMC engineering personnel. They would have needed to develop the necessary skills and expertise to achieve levels of EMC design confidence that were at least an order of magnitude (e.g. for SIL1) higher than is currently achieved. This has not proved to be practical for several reasons, so instead the IET has now developed guidelines that only need practitioners of EMC engineering and functional safety hardware/software design (and its independent assessment) to develop their existing skills and expertise by a reasonable amount to achieve EMC for functional safety for any SIL.