Evaluacion de impacto

Interactive textbook at http://www.worldbank.org/pdt

Impact Evaluation in Practice

Paul J. Gertler, Sebastian Martinez, Patrick Premand, Laura B. Rawlings, Christel M. J. Vermeersch

Impact Evaluation in Practice

Impact Evaluation in Practice is available as an interactive textbook at http://www .worldbank.org/pdt. The electronic version allows communities of practice and colleaguesworking in sectors and regions, as well as students and teachers, to share notes and related materials for an enhanced, multimedia learning and knowledge-exchange experience. Additional ancillary material specific to Impact Evaluation in Practice is available at http://www.worldbank.org/ieinpractice.

This book has been made possible thanks to the generous support from the Spanish ImpactEvaluation Fund (SIEF). Launched in 2007 with a $14.9 million donation by Spain, and expanded by a $2.1 million donation from the United Kingdom’s Department for International Development (DfID), the SIEF is the largest trust fund focused on impact evaluation ever established in the World Bank. Its main goal is to expand the evidence base on what works to improve health, education, and social protectionoutcomes, thereby informing development policy. See http://www.worldbank.org/sief.

Impact Evaluation in Practice
Paul J. Gertler, Sebastian Martinez, Patrick Premand, Laura B. Rawlings, Christel M. J. Vermeersch

© 2011 The International Bank for Reconstruction and Development / The World Bank 1818 H Street NW Washington DC 20433 Telephone: 202-473-1000 Internet: www.worldbank.org Allrights reserved 1 2 3 4 13 12 11 10 This volume is a product of the staff of the International Bank for Reconstruction and Development / The World Bank. The findings, interpretations, and conclusions expressed in this volume do not necessarily reflect the views of the Executive Directors of The World Bank or the governments they represent. The World Bank does not guarantee the accuracy of the dataincluded in this work. The boundaries, colors, denominations, and other information shown on any map in this work do not imply any judgement on the part of The World Bank concerning the legal status of any territory or the endorsement or acceptance of such boundaries. Rights and Permissions The material in this publication is copyrighted. Copying and/or transmitting portions or all of this work withoutpermission may be a violation of applicable law. The International Bank for Reconstruction and Development / The World Bank encourages dissemination of its work and will normally grant permission to reproduce portions of the work promptly. For permission to photocopy or reprint any part of this work, please send a request with complete information to the Copyright Clearance Center Inc., 222Rosewood Drive, Danvers, MA 01923, USA; telephone: 978-750-8400; fax: 978-750-4470; Internet: www.copyright.com. All other queries on rights and licenses, including subsidiary rights, should be addressed to the Office of the Publisher, The World Bank, 1818 H Street NW, Washington, DC 20433, USA; fax: 202-522-2422; e-mail: pubrights@worldbank.org. ISBN: 978-0-8213-8541-8 eISBN: 978-0-8213-8593-7 DOI:10.1596/978-0-8213-8541-8 Library of Congress Cataloging-in-Publication Data Impact evaluation in practice / Paul J. Gertler ... [et al.]. p. cm. Includes bibliographical references and index. ISBN 978-0-8213-8541-8 -- ISBN 978-0-8213-8593-7 (electronic) 1. Economic development projects--Evaluation. 2. Evaluation research (Social action programs) I. Gertler, Paul, 1955- II. World Bank. HD75.9.I472010 338.90072--dc22 2010034602

Cover design by Naylor Design.

CONTENTS
Preface PART ONE. INTRODUCTION TO IMPACT EVALUATION Chapter 1. Why Evaluate? Evidence-Based Policy Making What Is Impact Evaluation? Impact Evaluation for Policy Decisions Deciding Whether to Evaluate Cost-Effectiveness Analysis Prospective versus Retrospective Evaluation Efficacy Studies and Effectiveness Studies...