The main purpose of this research project was to assess the impact of the Cambio Magistral initiative (CMI) on student engagement in the STEM courses involved. CMI is an institutional program aimed at supporting professors in the implementation of changes in their large lecture courses with the following goals: increasing student participation and engagement, fostering formative assessment practices, and incorporation of technology in support of pedagogical practice. The study responds to the following research questions: How do students perceive their learning experience in Cambio Magistral courses? How do students evaluate their commitment to their learning in Cambio Magistral courses? What kinds of engagement do student demonstrate during the Cambio Magistral classes? The study followed a quantitative research design, descriptive in nature, using class observations protocols and survey as the main data collection techniques. The students in the STEM courses involved were observed and surveyed during two semesters. Results both in terms of class observations and self-reported student data show a high level of student engagement with course content and increased frequency of higher-level cognitive activities in response to the pedagogical strategies enacted by professors.