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FEEDBACK is a SOFIA legacy program dedicated to study the interaction ofmassive stars with their environment. It performs a survey of 11 galactic highmass star forming regions in the 158 $\mu$m (1.9 THz) line of CII and the 63$\mu$m (4.7 THz) line of OI. We employ the 14 pixel LFA and 7 pixel HFA upGREATinstrument to spectrally resolve (0.24 MHz) these FIR structure lines. With anobserving time of 96h, we will cover $\sim$6700 arcmin$^2$ at 14.1$''$ angularresolution for the CII line and 6.3$''$ for the OI line. The observationsstarted in spring 2019 (Cycle 7). Our aim is to understand the dynamics inregions dominated by different feedback processes from massive stars such asstellar winds, thermal expansion, and radiation pressure, and to quantify themechanical energy injection and radiative heating efficiency. The CII lineprovides the kinematics of the gas and is one of the dominant cooling lines ofgas for low to moderate densities and UV fields. The OI line traces warm andhigh-density gas, excited in photodissociations regions with a strong UV fieldor by shocks. The source sample spans a broad range in stellar characteristicsfrom single OB stars, to small groups of O stars, to rich young stellarclusters, to ministarburst complexes. It contains well-known targets such asAquila, the Cygnus X region, M16, M17, NGC7538, NGC6334, Vela, and W43 as wellas a selection of HII region bubbles, namely RCW49, RCW79, and RCW120. TheseCII maps, together with the less explored OI 63 $\mu$m line, provide anoutstanding database for the community. They will be made publically availableand will trigger further studies and follow-up observations.

FEEDBACK: a SOFIA Legacy Program to Study Stellar Feedback in Regions of Massive Star Formation