This volume puts forward a group of models applied to different economies, capturing the progress and growth of their economic systems. The models provide a quantified framework for the formulation of economic policy. They aid the introduction of targets and policy instruments taking account of constraints in the process of development. Also, an evaluation of external and internal shocks is taken using a comparative static type of analysis. The models take into account constraints which are in the nature of institutional as well as supply constraints. Problems of data exist in any quantitative analysis and account was taken of this factor in presenting the models and the results reached. Nonetheless, the models attempt to specify, estimate and simulate a given macroeconomic system. Models of this type are not freely available to the interested reader, but only in a fragmented way. This book puts the efforts of a group of economists worldwide under one cover. It is believed that the collection will be of interest both for courses in planning and for those adviSing these countries such as international organizations, research bodies, etc. Moreover, an overview of trade policy and income distributional factors is presented. It is hoped that this collection will prove interesting and useful to economists world wide.