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The determination of atmospheric parameters is the first and most fundamentalstep in the analysis of a stellar spectrum. Current and forthcoming surveysinvolve samples of up to several million stars, and therefore fully automatedapproaches are required to handle not just data reduction but also theanalysis, and in particular the determination of atmospheric parameters. Wepropose that a successful methodology needs, at the very least, to pass aseries of consistency tests that we dub the 'four-step program'. This andrelated issues are discussed in some detail in the context of the massive dataset to be obtained with the Radial Velocity Spectrometer onboard Gaia

Stellar Atmospheric Parameters: The Four-Step Program and Gaia's Radial Velocity Spectrometer