Book excerpt: This new volume of Current Topics in Developmental Biology covers developmental timing, with contributions from an international board of authors. The chapters provide a comprehensive set of reviews covering such topics as the timing of developmental programs in Drosophila, temporal patterning of neural progenitors, and environmental modulation of developmental timing. - Covers the area of developmental timing - International board of authors - Provides a comprehensive set of reviews covering such topics as the timing of developmental programs in Drosophila, temporal patterning of neural progenitors, and environmental modulation of developmental timing