Figure shows a summary of the recorded compositiondependent ηOER and ΔηOER for each MOBO iteration. The data set can be found in Table in the Supporting Information. After initialization, subsequent suggestions all focus on compositions yielding an ηOER below 550 mV and ΔηOER below 15 mV. Multidimensional scaling (MDS) of the quinary parameter space in Figure (for activity) and Figure (for stability) indicates that Mn seems to play an important role in achieving the global optimum. The gray points in the MDS plots represent the total search space. Figure illustrates how, after initialization, the MOBO algorithm quickly focuses on sampling Mn-rich compositions.