For more than a decade, researchers from around the world have been studying the impact of techlogy on the teaching and learning of mathematics. However, much of this research has t yet been taken into account in teaching, in research, and in the development of new curricula. In these two volumes a distinguished group of national and international mathematics education researchers provide insights into the impact of techlogy on the teaching and learning of mathematics. The first volume presents syntheses of techlogy-related research related to various areas of mathematics, mathematics teaching, and equity. The second volume presents case studies of the role of research in the development of techlogy-intensive curricula and tools. The second volume concludes with perspectives from other authors who address cross-cutting themes in the two volumes.