Session 1 - Optical Spectroscopy.- The O stars-optical review (Invited Lectune)..- H alpha variations in two mass losing stars..- Short term variability of line strengths in some Of and Wolf-Rayet stars..- Mass loss in the spectrum of the 06.5f binary HD 153919..- Mass loss of B1 la-O super-giants and evolutionary consequences..- On the formation of the continuous spectrum and emission line profiles of P Cygni..- Evidence for non-isotropic mass loss from central stars of some emission nebulae..- Mass loss from Eta Carinae.- Wolf-Rayet stars in the Magellanic Clouds..- Stellar outflow: relative motions of nebulae and Of stars..- Session 2 - Ultraviolet Spectroscopy.- An ultraviolet view of stellar winds (Invited lectune).- Modelling of UV resonance lines..- O VI in stellar winds..- C IV resonance line profiles in O stars..- Winds in hot, subluminous stars..- Temperatures and radii of O stars..- Analysis of UV spectrophotometric observations for O-type stars..- The effective temperatures of the O stars..- Session 3 - Infrared and Radio Data.- Radio and infrared emission by O-type and related stars (Invited Lectune)..- Near infrared spectra of O stars and related objects..- Infrared observations of HDE 226868/Cyg ?-1 and HDE 245770/A 0535+26..- Infrared excesses and mass loss: Implications for OB stars in Carina and the LMC..- Radio emission from flows..- Radio observations of stellar mass loss.- Radio emission from hot stars at two centimeters..- Session 4 - Panel Discussion on Stellar Wind Theories.- The theory of mass loss from hot stars (Introductory paper)..- Radiatively-driven winds: Model improvements, ionization balance and the infrared spectrum..- The warm wind model..- The corona plus cool wind model for Of stars and OB supergiants..- The thermodynamic requirements on atmospheric models imposed by observed stellar nonthermal mass fluxes and by those observed nonthermal features enhanced in Xe stars..- Session 5 - Theory and Mass Loss Rates — Binary Stars — Miscellaneous Topics.- The domain of radiatively driven mass loss in the HR diagram..- Stellar corona models..- Synthetic line profiles in early-type stellar winds. I. H and He+..- The H? profile in Zeta Puppis..- The mass loss rate of ? Velorum..- Wind models for ? Orionis.- Binary frequency among the O-type stars..- Contact binaries of spectral type O..- The O-type spectroscopic binary system HD 149404..- The O-type spectroscopic binary system HD 93206..- Mass flow and evolution of UW Canis Majoris..- The spectroscopic binary ?2 Velorum..- The binary orbit of HD 92740..- Results from the 1977 coordinated observing campaign on HD 226868=Cygnus X-1..- The nature of the runaways: old disk population OB stars?.- The distribution in luminosity of OB stars and evolutionary time scales..- H-deficiency and mass loss..- Session 6 - Evolution with Mass Loss: Single Stars.- Evolution of single stars with mass loss (Invited Lectune)..- Theoretical evolution of massive stars with mass loss by stellar wind..- Critical rates of mass loss..- Supergiant mass loss and the Cassiopeia A progenitor..- The role of rotation in the evolution of massive stars losing mass..- Evolution of a 30 Mo star with mass loss..- Mass conservation and rapid mass loss on the main sequence..- Session 7 - Evolution with Mass Loss: Double Stars.- Evolution of binary stars with mass loss (Invited Lecture)..- Evolution of massive common envelope binaries and mass loss..- The influence of stellar wind mass loss on the evolution of massive close binaries..- Common envelope binaries and mass loss..- HD 50896: an other WR binary star..- Session 8 - Evolutionary Scenario and the wr Connection.- Evolution of O stars and the WR connection (Invited Lectune)..- The galactic WN7/WN8 stars as massive O stars in advanced stages of evolution..- The chemical nature and evolutionary status of the Wolf-Rayet stars..- Of-WN evolution: spectral types and effective temperatures..- Observations of velocity fields in WN and Of stars..- BE 381: WN9 or 08 Iafpe?.- Conservative and non-conservative evolutionary computations in connection with Wolf-Rayet binaries..- Summary of the conference Projects for future research..