The Belgian Repository of fundamental Atomic data and Stellar Spectra, BRASS, aims to take the first, crucial steps towards removing systematic errors in atomic input data required for quantitative stellar spectroscopy. We will thoroughly assess the quality of fundamental atomic data available in the largest repositories, such as wavelengths and oscillator strengths, by comparing very high-quality observed stellar spectra, taken using the Mercator-HERMES and ESO-VLT-UVES spectrographs, with state-of-the-art theoretical spectra. BRASS will offer both critically-evaluated atomic transition data and high-quality stellar spectra, spanning the entire visible wavelength range for BAFGK spectral types, via an online public interactive interface under development.

To date we have compiled atomic line transition data, for ions of up to 5+ and in the visible wavelength range, from major online repositories including NIST, VALD, and multiple data providers currently in the VAMDC portal. We have cross-matched multiple literature occurrences of atomic transitions for over 75,000 individual lines in preparation for our systematic quality assessment and revealed a significant scatter in literature log(gf) values of up to 2 dex. Almost 3000 unique atomic lines, spanning the BAFGK spectral types, have been selected for quality assessment and quality assessment work is currently underway.