The quantitative Read-Across Structure-Activity Relationship (q-RASAR) concept has been developed by the DTC Laboratory, Jadavpur University by merging Read-Across and QSAR. It is a statistical modeling approach that uses the similarity and error-based measures as descriptors in addition to the usual structural and physicochemical descriptors, and it has been shown to enhance the external predictivity of QSAR/QSPR models.