Laser flash photolysis measurements on the kinetics of the title system in a He bath gas are reported for the temperatures 290, 473, and 700 K and a pressure range of 7.6-678 Torr. CH3 and OH radicals were generated simultaneously by 193 nm photolysis of acetone containing traces of water, with CH3 in large excess. The course of reaction was followed by monitoring the concentration of OH using laser-induced fluorescence (LIF), while CH3 was monitored by absorption at 216.4 nm. The experimental data were analyzed in the first instance by a simple model based on the decay of OH and CH3, which was verified by more: comprehensive numerical simulations. Further analysis of the data, using a combined master equation/inverse Laplace transform/RRKM procedure, yielded estimates of the association rate coefficient of CH3 and OH (k(l)(infinity) = (8.0 +/- 0.3) x 10(-11) (T/300 K-0.79+/-0.09 cm(3) molecule(-1) s(-1)) and for the enthalpy change for the CH3 + OH --> (CH2)-C-1 + H2O channel (Delta H-0(-) = 1.6 +/- 2.0 kJ mol(-1)). Pressure-dependent rate coefficients for the various channels are also calculated and parameters for a modified Troe representation determined.