The Active Learning Model, based on the constructivism theory, allows students to have an active role in their own learning process. The model stimulates the construction of an environment where exists an effective interaction between students and teacher, supported by activities that motivate this kind of behavior. Currently the technology supports the Active Learning Model by the use of Classroom Response Systems. These systems, usually supported by pen-based technology (e.g. Tablet PCs), allows the teacher to propose questions to the students, that submit their answers electronically back to the teacher. Then, that answers can be aggregated and displayed to the students, which facilitates the teacher's feedback and the classroom collaboration and discussion. However, studies involving the use of Classroom Response Systems show that this kind of system generate student's loss of attention and focus. Also, the specific use of a single device limits the use of technology, not considering the increasing presence of many different types of devices in the classroom. In that way, this work described the creation of a Ubiquitous Classroom Response System (UCRS), a framework that uses the ubiquitous computing main concepts in order to support the Active Learning in classroom. In order to support a natural and not invasive use of technology, the UCRS uses context information (profile, historical and physical) to allow the creation of a dynamic environment where students can use any available mobile device to answer the teacher's questions, interact with each other and receive feedback. 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