About Didactic Transposition: Teaching programming fundamentals at different levels of the school system

This paper introduces a new approach for the analysis of didactic transposition phenomenon in Computer Science education, and its foundations for the construction of teaching objects. Thus, two main scenarios were explored: teaching experiences on programming fundamentals at undergraduate level, and the construction and deployment of teaching objects which have been framed within the European project called Open Discovery Space for K-12 education, by using computing means. The description of experiences in both scenarios is documented according to the following schema: A theoretical background, the findings, and the statement of new proposals to improve teaching practices and the criteria for constructing teaching objects as conclusions of this paper.