The aims of this paper are: (1) To summarize the available knowledge on the use of the flat dilatometer test (DMT) for evaluating sand liquefiability. (2) To formulate a new tentative correlation for evaluating the cyclic resistance ratio CRR from the DMT horizontal stress index KD, to be used according to the “simplified procedure” (Seed & Idriss 1971). The proposed CRR-KD correlation combines previous CRR-KD curves with current correlations for evaluating CRR from CPT and SPT, translated using the relative density Dr as intermediate parameter.