  In this paper we present Complete Stellar models (CoStar) for massive stars,
which treat the stellar interior and atmosphere, including its wind. Particular
emphasis is given to Wolf-Rayet stars. We address the question of the effective
temperatures of WNE and WC stars. Our first results show a satisfactory
agreement between the CoStar models and the simple temperature correction
method applied by Schaller et al. (1992). An analyses of the subphotospheric
structure of the WR star models shows the importance of metal opacity. This may
be essential for understanding the driving mechanism of Wolf-Rayet winds.
