Abstract: I will describe how our institute has used GeoGebra to model effective teaching/learning strategies for the sake of lasting improvement and change in teacher’s pedagogies. I will first describe the Institute and then give the rationale for choosing GeoGebra as the preferred dynamic mathematics software. GeoGebra is a free, open source, multi-platform, translatable, dynamic mathematics software that has an extensive and very active international community of users who support each other with teaching materials and technical support in the use of the program. Examples of the use of GeoGebra will be shown where algebra and geometry are connected allowing users to explore multiple representations of math concepts. I will close presenting some data that shows the impact that the institute has had in the in-service teachers, in the district as well as in the university.