  This article is an updated version of an entry of the Encyclopedia of
Mathematics Education (2018). In the same time, it is the seed of the HAL
collection DAD-MULTILINGUAL, constituted by the translation of this entry in
various languages.The documentational approach to didactics is a theory in
mathematics education. Its first aim is to understand teachers' professional
development by studying their interactions with the resources they use and
design in/for their teaching. In this text we briefly describe the emergence of
the approach, its theoretical sources, its main concepts and the associated
methodology. We illustrate these aspects with examples from different research
projects. This synthetic presentation is written for researchers, but also for
non-specialists (e.g. master students) interested in a first discovery of the
documentational approach.
