Technology is increasingly becoming an important part of STEM teaching and learning in the 21st Century.There have been numerous attempts to integrate technology into education systems, but without serious development and research the success of these attempts have been limited.Recently, together with my colleagues in Hungary, we started a project called GeoMaTech to develop high-quality teaching and learning materials for all grades in primary and secondary schools in Hungary.These materials (1200+ Mathematics, 600+ Science) will be embedded into an on-line communication and collaboration environment that can be used as an electronic textbook, a homework system, and a virtual classroom environment.