The field of development economics has evolved since volume 3 of the Handbook of Development Economics was published more than a decade ago. Volume 4 takes stock of some of the newer trends and their implications for research in the field and our understanding of economic development. The handbook is divided into four sections which reflect these developments, of which the first deals with agricultural and rural development. Section two is concerned with developments in the theory and evidence regarding public goods and political economy. The third section is focused on the behavior of households and individuals regarding various aspects of human capital investments, in the face of the various constraints, particularly market incentives and public goods. The final section contains papers that describe the different methods now available, both experimental and non-experimental, to conduct program evaluations, as well as describing papers that implement these methods. The authors of the chapters are all experts in the fields they survey and extend, and this volume promises to be an invaluable addition to the Handbooks in Economics series and a useful reference to graduate students, researchers and professionals in the field of development economics.