  This is a summary of presentations delivered at the OC1 parallel session
"Primordial Gravitational Waves and the CMB" of the 12th Marcel Grossmann
meeting in Paris, July 2009. The reports and discussions demonstrated
significant progress that was achieved in theory and observations. It appears
that the existing data provide some indications of the presence of
gravitational wave contribution to the CMB anisotropies, while ongoing and
planned observational efforts are likely to convert these indications into more
confident statements about the actual detection.
