This paper refers to the design of a project concerning an educational teaching experiment that focuses on the development of the curriculum on the 7th grade of basic education, by integrating the graphing calculator. Using a learning environment with an exploratory nature, based on diversified tasks involving the use of graphing calculator, we aim to create an innovative curriculum in this level of education. This study is supported by the Activity Theory and seeks to understand how students, in solving specific tasks with the aid of the graphing calculator, builds their mathematical knowledge embedded in a learning community. More specifically we seek to understand the instrumental genesis and the semiotic potential played by technology in a student's activity system, developing the process of semiotic mediation. Methodologically we will adopt a qualitative paradigm, supported by a Design Research process.