This multidisciplinary team seeks to define qualitative and, to some extent, quantitative methods that can be adapted to complex contemporary contexts marked by cultural diversity. One portion of the team creates instruments with true transcultural validity, such as the Avicenne ELAL, to evaluate the bilingualism of the children of migrants, and more generally, to enable the construction of a method to make all of our tools — of identification, diagnosis, evaluation, and care — transcultural. This group also works with migrants and the effects of trauma. Another part of the team focuses on the epistemological and methodological study of quantitative approaches in medicine, in particular, subjective measures in health (latent variables, etc.). Finally, a third group works on qualitative methods applied to clinical care of adolescents and on the ethics and models of their management.