  We present a state-of-the-art analysis technique able to simultaneously
reproduce the entire H and He spectra of OB-type stars in the visual and the
near-IR and to derive highly accurate metal abundances (so far C and N). The
spectrum synthesis relies on a hybrid non-LTE approach involving our most
recent model atoms. Accurate atmospheric parameters, with reduced systematic
errors, are derived spectroscopically (from Stark-broadened H lines and
ionization equilibria of He I/II and C II-IV) for a sample of randomly
distributed stars in the solar vicinity. Highly consistent abundances are found
in contrast to previous reports indicating broad scatter and large
uncertainties. The improvements result from avoidance of systematic errors in
the parameter determination, which may be larger than expected in previous
work, and a critical evaluation of atomic data for the model atom construction.
