The appropriate use of technologiy in mathematics teaching can greatly support the teaching and learning of mathematics. on the one hand technology can be supportive in learning how mathematical knowledge can be used, on the other hand it offers valuable support for the appropriate development of mathematical concepts. geomery is an important part of school mathematics- it is an area in which the students learn to build a mathematical (geometrical) model of real situations already in early scool years.therefore it is of great importance that the geometrical conceps are developed appropriately-in terms of basic mathematical consepts, which will be built upon in the next 8-10 school years dynamic geometry software (DGS) offers tools and possibilities, which can considenrably improve the teaching of basic geometrical concepts in the primary (as well as in hingher) grades. we use cabri geometre II to show, discuss, and analyze examples on how DGS can support the development of generic geometrical concepts in the first years of learning mathematics.