A novel technique has been developed wherein dielectric analysis (DA) and differential thermal analysis (DTA) are performed simultaneously on a single test material. The speed of data acquisition and the range of frequencies and temperatures that can be investigated in a single experiment are far beyond the capabilities of conventional techniques. The present technique, which features extensive automation in data acquisition and processing, is illustrated by preliminary measurements on Colorado Green River oil shale. The results indicate that a combined use of DA and DTA techniques yields useful information for elucidation of thermal decomposition and phase transformation mechanisms.