This paper provides a nontechnical overview of the Global Economic Model (GEM), a new multicountry model based on strong microeconomic underpinnings developed in the Research Department of the International Monetary Fund.GEM was, above all, a collaborative effort. The idea came from then Economic Counsellor Kenneth Rogoff, and the main development was accomplished by Douglas Laxton of the IMF's Research Department, and Paolo Pesenti, who came to the Fund on a six-month assignment from the Federal Reserve Bank of New York. They were ably assisted by Susanna Mursula, also of the Research Department. Without the energy and drive of these three individuals the project would not have got off the ground. Since then, many others have also made important contributions to different aspects of the project that range from providing useful comments and helping to build the toolbox to support GEM development to using or extending the model to address real world policy issues. Principal among them have been Stéphane Adjemian,

• The presence of a pacemaker or automatic implanted cardioverter defibrillator is no longer an absolute contraindication to magnetic resonance imaging. • Strict protocols enable diagnostic quality images to be obtained with minimal risk. • Close collaboration among radiologists, cardiologists and device manufacturer representatives is required.

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