Diffusion in non-magnetic stars and COROT

New developments in the modeling of non-magnetic non-rotating A stars have had a major impact on our understanding of the formation of abundance anomalies in these stars. The great sensitivity of the pulsational properties as well as of the observable chemical composition to the internal mixing processes in chemically peculiar stars make these objects potentially important tools to investigate the depth and nature of that mixing. Some possible implications for the seismology of A and B stars are discussed in light of what the COROT mission could contribute to the study of these stars and of the importance of these objects in the overall success of a mission such as COROT.