contacting one or more olefinic monomers in a single reactor containing a bicomponent catalyst system comprising a first catalyst component and a second catalyst component, wherein the bicomponent catalyst system comprises two different Ziegler-Natta catalysts each characterized by a catalyst productivity and a chain-transfer-agent response; the single reactor being characterized by a chain-transfer-agent concentration and a temperature; the productivity of the second catalyst component having a substantially different temperature dependence than that of the first catalyst component; the chain-transfer-agent response of the second catalyst component having a substantially different sensitivity than that of the first catalyst component;

effectuating the polymerization of the olefinic monomers to produce an olefin polymer characterized by a flow index, I₂₁ and a melt flow ratio, I₂₁/I₂; and achieving in a coordinated manner the target flow index by controlling the chain transfer agent concentration and the melt flow ratio by controlling the reactor temperature.