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We describe the development and implementation of the SEGUE (Sloan Extensionfor Galactic Exploration and Understanding) Stellar Parameter Pipeline (SSPP).The SSPP derives, using multiple techniques, radial velocities and thefundamental stellar atmospheric parameters (effective temperature, surfacegravity, and metallicity) for AFGK-type stars, based on medium-resolutionspectroscopy and $ugriz$ photometry obtained during the course of the originalSloan Digital Sky Survey (SDSS-I) and its Galactic extension (SDSS-II/SEGUE).The SSPP also provides spectral classification for a much wider range of stars,including stars with temperatures outside of the window where atmosphericparameters can be estimated with the current approaches. This is Paper I in aseries of papers on the SSPP; it provides an overview of the SSPP, and initialtests of its performance using multiple data sets. Random and systematic errorsare critically examined for the current version of the SSPP, which has beenused for the sixth public data release of the SDSS (DR-6).

The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests