Suppose that one has used a specific flavour of density functional theory (DFT), say the popular generalised gradient approximation (GGA) with the PBE parameterisation (PBE), to enumerate the phases 𝑆 0 𝐶 within the chemical space C = {Ti, P, S}. There are currently no materials recorded in the Materials Project 2 for this example chemical space, and therefore might potentially be a material discovery target. There are, however, materials that have been identified for the chemical sub-spaces {Ti, P}, {Ti, S}, and {P, S}. Hence, to compute the E h for a material made from C, one can use the values of the total energies of the lowest energy materials made from the three subspaces, which would be 6 materials: a material made from {Ti, P}, {Ti, S}, {P, S}, {Ti}, {P} and {S}. The standard procedure for the evaluation of E h involves expressing the formula of the structure 𝑆 0 𝐶 in terms of a linear combination of the most stable known phases within the 6 chemical sub-spaces. The linear combination is given by