This article deals with material designedwithin the framework of a teacher developmentproject coordinated by the authors and aimed at providing support forin-servicesecondary school teachers whouse or consider using Dynamic Geometry Software (DGS) to develop instructionalsequences in mathematics classrooms.The project contains worksheetsprepared as text support by authorsandincluded in the Teacher´s Guide (Fioriti et al., 2014a, 2014b, 2014c), which was provided to students in the context of a teacher development course.A premise of the course is that problem solving is avehicle for students to learn mathematics meaningfully. To enable this kind of learning, the classroom should be organized as a learning community, and technology should be incorporated as a tool for expanding mathematical knowledge.