Rotation, lithium and mixing -- Surface abundances -- Stellar rotation prior to the main sequence -- The internal rotation of the sun -- Loss of mass and angular momentum: The observational point of view -- Pre-main sequence evolutionary tracks and lithium burning -- Mass transport and mixing by waves -- Turbulent transport in stratified and rotating fluids -- Penetration and overshooting from a convection zone -- Turbulent transport in stellar radiation zones: Causes and effects -- Will a magnetic field inhibit turbulent transport? -- Fast dynamo action-A critical problem for solar magnetism -- Observational constraints on the turbulent diffusion coefficient in late type stars -- Probing stellar interiors -- Conclusion.

The 14 papers in this collection discuss recent progress in areas such as mixing in stellar interiors, redistribution and loss of angular momentum, emphasizing in particular the effects of turbulence. An introductory review by E. Schatzman, to whom this volume is dedicated, is followed by three sections: observational facts (surface abundances, stellar rotation, loss of mass and angular momentum, etc.), physical knowledge (mass transport and mixing by waves, turbulent transport, fast dynamo action, etc.), and the interpretation of observations.