This book provides a comprehensive account of the theoretical structures, database, computation and application of ORANI-INT. ORANI-INT is a multi-period elaboration of ORANI, a well-known computable general equilibrium model of the Australian economy.The implications of assuming that expectations are model consistent are contrasted with those of the alternative assumption that expectations are static. A generic algorithm for solving a wide range of economic models is described in detail. The algorithm is portable because it is implemented in GEMPACK, a commercially available software package. The major application reported in the book addresses the issue whether tariff reform policies should be announced ahead of their implementation. Many of the multisectoral models used throughout the world are static. The methodology presented in the book demonstrates that such models can be easily embedded into an intertemporal framework.