Excess molar enthalpies H-m(E) of {xCH(3)COCH(3) + (1 - x)CH3C(CH3)(2)OCH3} and {x(1)CH(3)OH + x(2)CH(3)COCH(3) + (1 - x(1) - x(2))CH3C(CH3)(2)OCH3}, measured with a flow microcalorimeter at the temperature 298.15 K, are reported. The experimental results have been correlated with polynomial equations and compared with those calculated from an association model having binary and ternary parameters.