It reflects on how to reveal the significance of scientific and pedagogical purpose and field of action in educational research through the scientific 'analysis argumentative logic, built by the researcher, in an attempt to improve teaching methodological guidance to those who want to venture into the construction process of scientific knowledge in this field. Subsequently, a critical analysis of the correspondence between the research logic and the formative nature of the objects and fields declared is done, by concrete examples of doctoral theses in the educational field, to contribute to the training of researchers.