We review our knowledge of the mixing properties of magnetic OB stars and
discuss whether the observational data presently available support, as
predicted by some theoretical models, the idea that magnetic phenomena favour
the transport of the chemical elements. A (likely statistical) relationship
between enhanced mixing and the existence of a field has been emerging over the
last few years. As discussed in this contribution, however, a clear answer to
this question is presently hampered by the lack of large and well-defined
samples of magnetic and non-magnetic stars.Comment: 5 pages, one colour figure. In 'Four decades of research on massive
stars: a scientific meeting in honour of A.F.J. Moffat', ASP Conf. Series, in
pres