The school-based control of schistosomiasis and soil-transmitted helminth (STH) infections is of proven cost-effectiveness. This book describes an approach in which epidemiological data are used to select the control strategy to be applied to the school-age population and shows how periodic data collection from sentinel sites can be used to monitor the progress of control activities.This book is intended to help managers plan, implement, and monitor programs for deworming school-age children using methods based on the best current evidence and experience. Nine examples from existing school health programs are presented to illustrate specific aspects of deworming intervention.This revised edition incorporates more recent experiences and lessons learned from school-based control programs in several countries not previously reported. It also includes references to web sites where useful information is available.