Many studies on metacognitive processes have been carried out, in particular with regard to the stimulation of their development in students. There also have been profuse investigations on the various kinds of knowledge that professors bring into play in teaching. These two lines of research remain isolated, as are those that study the construction of the social and personal epistemology of professors. The question we are interested in refers to the possible fertility of the joint inquiry into

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... hese four fields of research, with the purpose of knowing what the professors' decision-making processes are like, regarding the theory and the practices of teaching knowledge and metacognitive skills to their students.