definiens: shall mean a meta l mediated polymerization that proceeds by a polymerization reaction other than free radical, co ntrolled free radical, and carbocationic mechanisms . For the Vinyl Chloride Field and Polar Comonomer within Exh ibit A, Coordination Polymerization mechanisms will be determined by examination of the effect of the meta l on the relative copolymerization rate constants : i.e., monomer selectivities . In controlled free radical a nd free radical polymerizations the metal is not in volved in the propagation steps and therefore it does not affect the microstructure, sequence distributions, or como nomer content in a copolymerization . The presence and str ucture of the active metal complex in a Coordinatio n Polymerization must have a direct and significant e ffect on the microstructure and comonomer content o f the polymer because the metal is involved in each propa gation step during the polymerization . A test for Coordination Polymerization would be to run two der ivatives of the catalyst family ( e.g. one with bulk y ligands, one less bulky ) in a copolymerization ; changes in c omposition of the polymer will be indicative of Coo rdination Polymerization . Tests comparing the composition and r1 / r2 of polymers obtained using conventional free radical initiators with those obtained using the will also be performed