A method of selecting catalysts for making a product specific polyolefin using a blend polydispersity index (bPDI) map, comprising: generating a plurality of polymers for at least two catalysts, wherein each polymer is generated at a different hydrogen to ethylene ratio in the presence of each of the at least two catalysts, wherein one of the at least two catalysts generates a higher molecular weight polymer and another of the at least two catalysts generates a lower molecular weight polymer; calculating a weight fraction of the lower molecular weight polymer (Flmw) and a weight fraction of the higher molecular weight polymer (Fhmw) from the amount of polymer generated by the first catalyst at each hydrogen to ethylene ratio and the amount of polymer generated by the second catalyst at each hydrogen to ethylene ratio; measuring the weight averaged molecular weight and PDI for each polymer; determining the relationship between the weight average molecular weight of the polymers generated by each of the at least two catalysts and the ratio of hydrogen to ethylene, wherein the relationship between the weight average molecular weight and the ratio of hydrogen to ethylene for a catalyst is determined from a linear fit of the formula: 1 / M w = Intercept + Slope ∗ H 2 / C 2; calculating a weight average molecular weight for the higher molecular weight polymer (hmw) and a weight average molecular weight for the lower molecular weight polymer (lmw) from the relationship of the weight average molecular weight and the ratio of the hydrogen to ethylene; and generating a family of bPDI curves for polymers that would be made using a plurality of ratios of a blend of the at least two catalysts for each of a plurality of ratios of hydrogen to ethylene, comprising generating a bPDI curve using the relationship bPDI = Flmw + Fhmw ∗ hmw / lmw ∗ Flmw ∗ lPDI + Fhmw ∗ hPDI ∗ lmw / hmw, wherein: 1PDI is the polydispersity of the lower molecular weight polymer component; hPDI is the polydispersity of the higher molecular weight polymer component; and 1PDI and hPDI are measured for each polymer; selecting a ratio for a blend of the at least two catalysts that generates a polymer having a bPDI that matches a polymer fabrication process; and confirming the ratio of the at least two catalysts by generating a polymer at each of the plurality of ratios of hydrogen to ethylene. generating a plurality of polymers for at least two catalysts, wherein each polymer is generated at a different hydrogen to ethylene ratio in the presence of each of the at least two catalysts, wherein one of the at least two catalysts generates a higher molecular weight polymer and another of the at least two catalysts generates a lower molecular weight polymer; calculating a weight fraction of the lower molecular weight polymer (Flmw) and a weight fraction of the higher molecular weight polymer (Fhmw) from the amount of polymer generated by the first catalyst at each hydrogen to ethylene ratio and the amount of polymer generated by the second catalyst at each hydrogen to ethylene ratio; measuring the weight averaged molecular weight and PDI for each polymer; determining the relationship between the weight average molecular weight of the polymers generated by each of the at least two catalysts and the ratio of hydrogen to ethylene, wherein the relationship between the weight average molecular weight and the ratio of hydrogen to ethylene for a catalyst is determined from a linear fit of the formula: 1 / M w = Intercept + Slope ∗ H 2 / C 2; calculating a weight average molecular weight for the higher molecular weight polymer (hmw) and a weight average molecular weight for the lower molecular weight polymer (lmw) from the relationship of the weight average molecular weight and the ratio of the hydrogen to ethylene; and generating a family of bPDI curves for polymers that would be made using a plurality of ratios of a blend of the at least two catalysts for each of a plurality of ratios of hydrogen to ethylene, comprising generating a bPDI curve using the relationship bPDI = Flmw + Fhmw ∗ hmw / lmw ∗ Flmw ∗ lPDI + Fhmw ∗ hPDI ∗ lmw / hmw, wherein: 1PDI is the polydispersity of the lower molecular weight polymer component; hPDI is the polydispersity of the higher molecular weight polymer component; and 1PDI and hPDI are measured for each polymer; 1PDI is the polydispersity of the lower molecular weight polymer component; hPDI is the polydispersity of the higher molecular weight polymer component; and 1PDI and hPDI are measured for each polymer; selecting a ratio for a blend of the at least two catalysts that generates a polymer having a bPDI that matches a polymer fabrication process; and confirming the ratio of the at least two catalysts by generating a polymer at each of the plurality of ratios of hydrogen to ethylene.