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What more is there in and for science education to do in terms of researching science lessons? A lot, the author suggests, if research turns away from studying science education extracting social facts using special methods, which journal articles require to state, to studying the work and methods by means of which participants themselves create their structured world of science lessons. This book presents, with concrete materials from an inquiry-oriented physics course, a way of doing science education research that radically differs from existing approaches.

This work presents one of the original and fundamental experiments of Didactique, a research program whose underlying tenet is that Mathematics Education research should be solidly based on scientific observation. Here the observations are of a series of adventures that were astonishing for both the students and the teachers: the reinvention of fractions and of decimal numbers in a sequence of lessons and situations that permitted the students to construct the concepts for themselves.