The project lasted two years and
was divided into the following stages: (a) a course of content and pedagogical update for the teachers; (b)
formulation of instructional strategies by the teachers themselves, using three instructional materials developed by
the CBME (table 1); (c) the implementation of such strategies in classrooms, with the participation of 1,311 students
of 7th and 8th grades of elementary education; and (d) the evaluation of the instructional strategies concerning the
teaching-learning process of the concepts involved. Regarding the last stage, the instrument used in the evaluation of
the strategies was a questionnaire containing 4 discursive questions addressed to the teachers. The data presented
here refer to the evaluation of instructional strategy number 3: “A baby switch at hospital”, focusing on the
possibilities offered for the teaching of this theme