A blend of poly(hydroxy ether of bisphenol A) (phenoxy) and poly(vinyl methyl ether) (PVME) was investigated by inverse gas chromatography (i.g.c.) over a wide temperature range. Specific retention volumes were measured for a variety of probes in pure and mixed stationary phases and interaction parameters were calculated. It was found that the polymer-polymer interaction parameter was probe-dependent. Two methods of data analysis recently proposed were applied in an attempt to eliminate this dependence. In both cases similar results were obtained with similar and large confidence intervals. I.g.c. experimental results were compared with theoretical calculations of an association model for polymer mixtures with specific interactions. A reasonable agreement was found.