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About the Author
John Tennent is a charter accountant, is managing director of Corporate Edge, a consultancy and training company. He specializes in business modelling and imvestment appraisal, and is a consultant to a wide range of global companies. He is the author of The Economist Guide to Financial Management and co-author of The Economist Guide to Business Modelling.
Graham Friend is managing director of Coleago Consulting, a firm that provides business planning and modelling support to telecommunications, media and technology companies.
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