A series of batch, bulk and solution (in toluene) copolymerizations of methyl methacrylate and vinyl acetate was performed under various reaction conditions to high monomer conversions. In addition, low conversion bulk experiments were performed to estimate monomer reactivity ratios using the error in variables model method, based on terminal model (Mayo-Lewis) kinetics. A combination of the low and high conversion data with data from a previous study yielded reactivity ratio (r) estimates of 27.465 and 0.0102 for r(MMA) and r(VAc), respectively, using the integrated copolymer composition (Meyer-Lowry) equation. In the high conversion experiments the effects of various factors on the reaction rate, cumulative copolymer composition, number- and weight-average molecular weights, and molecular weight distribution were studied. The factors included the monomer feed composition, initiator concentration, temperature, solvent concentration, and the addition of n-dodecyl mercaptan chain transfer agent. These factors were examined in light of the wide difference in the monomer reactivity ratios.