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We report the steps followed to set up an instrument oriented to detect two phenomena (intuitive simple approximation and feedback)in the answers given by high school students to questions concerning the finite limit of a sequence. We present our research's didactical and methodological frames. Along the field work described, we could collect answers from 143 students in three different high schools, in Madrid andon the outskirts. We include several global results, the criteria used to classify answers, the use that students make of the mentioned phenomena, and some difficulties that the students found when faced with our questions.

Uso por Alumnos de Bachillerato de los Fenómenos Aproximación Simple Intuitiva y Retroalimentación en Sucesiones