Modalidad MOOC: potencial para la colaboración en linea y la formación de los profesores.

Lecture given in the National Pedagogical University in Mexico, April 4th. From the comparison of two contrasted organisations dedicated to teachers training in mathematics (a small organisation developing over a long period, and a MOOC, targeting a large audience, over a very short period), the lecture aims to evidence the necessary features of teachers professional development programs: starting from teachers needs, based on the collaborative design of teaching resources, improving the quality of these resources by developing a reflective point of view on the process of design and use.