The propylene conversion vs. oxygenates selectivity profiles and the distribution of yield of oxygenates in the dataset (Fig. and, respectively) show that the vast majority of observations correspond to low performance. Indeed, 50% of the measured materials and conditions result in less than 2% oxygenates yield and only 41 measurements, out of 1220, are associated to yields of oxygenates above 20%. The average oxygenates yield over the whole data set is equal to 4.83% and the maximum $ %&'()*+,)- value is 26.85 %. By applying the SGD, we identified several SGs providing nearoptimal quality-function values (Fig. ). Among the SGs displaying quality-function values within 40% of the optimal value (see Fig. ), we selected, for further analysis and discussion, the SG that presents the highest value of cumulative Janson-Shannon divergence (0.693). This SG contains only 15 data points, i.e., approximately 1.2 % of the data set, which all have high yield of oxygenates (Fig. and, in black). The average yield of oxygenates in this SG is equal to 24.15%, i.e., five times higher than the average on the whole data set. This SG is described by rules on three descriptive parameters: 280 ≤ I ≤ 300℃, J K > 0.55, and 3.910 ≤ VY < 4.002 eV (Fig. ). The rule on the temperature highlights that the highest yields of oxygenates are observed for intermediate temperatures within the tested range of 200-400ºC (Fig. ). The rule on the phosphorus content shows that a relatively high phosphorus content is needed to achieve outstanding performance (Fig. ). This could be related to the dilution of metal active sites on a phosphate matrix that occurs at high phosphorus loadings.