This chapter presents a city simulator which incorporates an innovative blend of elements intended to overcome these problems: an integrated approach to sustainability, a 'whole of city' focus on interrelated programmes, a modelling approach built on empirical research, and an easy-to-use wizard-driven user interface. This complexity of the task is further compounded when the effects of intervention are no longer linear with respect to an apparently simple dimension such as city size. As an attempt to simplify these complications, Luis Bettencourt and Geoffrey West (2010) have argued that many characteristics of cities levels of innovation, crime, economic activity and density can be tolerably well estimated based on population statistics alone. Simulators have been further classified by methodological approaches, scope, subject and user interface. The Intelligent City Simulator, version 2.0, represents a collaborative partnership between Accenture and the United Nations Cities Programme. Its development took place in Australia, France and India across 2010.