The primary objective of this book is to advance the state of the art in specifying and—tting to data structural multi-sector dynamic macroeconomic models, and empirically implementing them. The fundamental construct upon which we build is the Ramsey model. A most attractive feature of this model is the insights it provides into the dynamics of an economy in tr- sition to long-run equilibrium. With some exceptions, Ramsey models are highly aggregated – typically single sector models. However, interest often lies in understanding the forces of e- nomic growth across multiple sectors of an economy and on how policy impacts likely play out over time. Such analyses call for more disaggregated models that can be fit to country or regional data.Thisbookshowshowto:(i)extendthebasicmodeltom- tiple sectors, (ii) how to adapt the basic model to account for policy instruments, and (iii)—t the model to data, and obtain equilibrium values both forward and backward in time from the data points to which the model is initially—t.