Inverse gas chromatography (IGC) has been used to calculate polymer-polymer interaction parameters and interaction energy densities in blends of poly(hydroxy ether of bisphenol A) (Phenoxy resin or PH) and poly(epsilon-caprolactone)(PCL). These parameters have been evaluated at three different compositions and a temperature range between 130 and 160-degrees-C from the Scott-Flory-Huggins formalism showing, in all cases, a marked dependence on the probes used. Two data analysis methods have been used, in an attempt to avoid the influence of the probe on the values of the interaction magnitudes. In both methods this influence has been clearly reduced and the trends in the resulting values are quite similar. Both methods give negative values of the polymer-polymer interaction parameter for all compositions and temperatures studied, reflecting the miscibility of the PH/PCL system due to hydrogen-bonding interactions. The values of the experimental interaction parameters obtained from these two methods agree with simulated data resulting from the application of the Coleman, Painter, and co-workers association model and all are in good agreement with the value of the interaction parameter derived from previous melting point depression studies.