Summary: This document describes one of the tasks of the work package "Provide calibrations of training data" (GWP-S-811-20000) within the CU8 work package "Training data" (GWP-S-811). The purpose of that work package is to provide a basis for the calibration of the General Stellar Parametrizer algorithms (GSP-phot and GSP-spec). This document recalls the principles of the calibration procedure proposed in Bailer-Jones (2009) and of the three level grid for reference stars as described in Heiter et al. (2009). We then focus on the selection of primary AP reference stars and the archives where relevant high quality spectra can be found for them. Some thoughts on how we will analyse this large amount of observational material are also given.
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