||Public concern over the possible health effects from electromagnetic fields (EMF) has led to the preparation of this handbook.Potential risks of EMF exposure from facilities such as power lines or mobile phone base stations present a difficult set of challenges for decision-makers. The challenges include determining if there is a hazard from EMF exposure and what the potential health impact is, i.e. risk assessment; recognizing the reasons why the public may be concerned, i.e. risk perception; and implementing policies that protect public health and respond to public concerns, i.e. risk management. Responding to these challenges requires the involvement of individuals or organizations with the right set of competencies, combining relevant scientific expertise, strong communication skills and good judgement in the management and regulatory areas. This will be true in any context, be it local, regional or even national or global.