This publication analyzes results of studies of educational policy and planning problems in Greece, Portugal, and Turkey. It is part of a project sponsored by the Organization for Economic Cooperation and Development (OECD) to increase understanding of the way in which educational systems function. The project examined existing structures; policy- and decision-making mechanisms; control of resources and information; and the relationships among educational subsystems and the social environment. As part of the project, Greece, Portugal, and Turkey examined decision-making mechanisms at various levels within their own educational systems. See SO 011 255 for details of the country reports. In this volume, part I presents the conceptual framework for educational decision-making within which the three countries examined their own mechanisms. Part II reviews educational development trends and planning characteristics in certain OECD member countries and analyzes the three country projects in terms of the decision-making framework. Part III explores structural aspects of educational administration in terms of the Turkish project. In part IV an attempt is made to draw some general planning implications as they emerge from the experience in the three countries. (RM)