Over the last years, computational, first-principles-based simulations have become a key tool in the global thrive towards a sustainable energy landscape. Density Functional Theory (DFT) has become in particular in heterogeneous surface catalysis a valuable means to explore reaction pathways and evaluate the catalytic ability of specific materials and active sites. Unfortunately, complex reaction pathways often occur which require the computation of a large number of intermediate's formation energies and reaction barriers, making it hard to utilize this approach for high-throughput screening of catalysts. The discovery of an often linear correlation of intermediate's adsorption energies, known as scaling relations has been thus a breakthrough in reducing the dimensionality of the catalytic activity space.