The goal of double-shift schooling is to extend access and minimize unit costs. However, since some systems only achieve those goals at the expense of educational quality, policy makers are faced with difficult choices when designing systems. Drawing on experiences in a wide range of countries, this book highlights the advantages and problems of double-shift systems. Comparison is made with single-shift systems, and also with systems having triple or even quadruple shifts. The book is intended for both national and regional policy makers and headteachers and others responsible for running double-shift schools. This is the third edition of a booklet first published in 1989 and updated in 2000. Thoroughly revised and updated, it retains all the virtues of its predecessors.