The tensions between teaching, extension and research appear as points of convergence of a practice under construction. They reveal the ethical impasses that mobilize the process of a teaching increasingly attuned to the daily work of the researcher in the cities. We think of extension as an ethical, interdisciplinary doing, emphasizing the investigative stance, which makes of each challenge and problem encountered, an opportunity not only to discover a question, but a resource to seek, propose and carry out actions pertinent to the educational objectives drawn; seeking relationships between daily actions and actions at a macro level, visualizing the needs and possibilities of an education for all. Here we articulate extension and praxis, including autistic; applied psychoanalysis; curricular accessibility; training processes.