The constructivist theory indicates that knowledge is not something finished and complete. However, the individuals must construct it through the interaction with the physical and social environment. The Active Learning is a methodology designed to support the constructivism through the involvement of students in their learning process, allowing them to make analysis, synthesis and evaluations, therefore developing their thinking and reasoning abilities. The technology supports active learning through Classroom Response Systems (CRSs), which usually use clickers devices to allow students to submit answers to a questionnaire proposed by the teacher. However, these systems have some drawbacks, for example not considering the students' individualities, personal characteristics and needs. In this way, this study describes the creation of the LSQuiz, a CRS that implements a collaborative process that allows teachers to propose questions to students, who may choose to solve them individually or ask colleagues to help solve them. The LSQuiz applies concepts related to ubiquitous computing, such as context awareness and the analysis of the interactions among students to determine which student is the most suitable at a given moment to provide help. The system validation indicates wide acceptance by students, who consider the possibility of classroom collaboration an important element to support their learning process. The experiment indicates that adopting a CRS associated with ubiquitous computing features is a valid and effective way to promote active learning. [For the complete proceedings, see ED557311.]