This research program is organised in three dimensions, corresponding to the major types of choices inherent in educational institutions: the choice of knowledge to be disseminated (praxeologies), the choice of teaching situations in which this dissemination should take place and the choice of training pathways. The 'praxeological choice' variable is combined with two other variables: the 'target group' variable (e.g. students in educational sciences) and the 'praxeological environment' variable (e.g. research and statistics methodology). Essentially, the target groups studied consist of: a) pupils in secondary education, b) students and researchers in educational sciences/didactics, c) mathematics teachers in secondary education, d) students in engineering schools. The praxeological environments are, essentially: 1) knowledge of mathematics, 2) knowledge of information retrieval on the Internet, 3) knowledge of sustainable development, 4) knowledge of research, including statistics and data analysis, 5) knowledge of the production and editing of texts, 6) didactic knowledge of study and teaching, both face to face and remotely. More...