This laboratory study aimed to test the model "Transformation of Added Organic material" (TAO) for its prediction capacities on Exogenous Organic Matter (EOM) from Madagascar and Reunion Island origins. The TAO model driven by biochemical data is particularly useful to predict complex EOM transformations in soil. The C mineralization of EOMs varied according to the nature of the material: (i) from 0.10 to 1.98 gC.g-1Cadded for the raw materials, (ii) from 0.28 to 0.84 gC.g-1Cadded for the composted materials, respectively. A "priming effect" was observed for few EOMs. For 83% of the studied EOM, the C mineralization was well predicted by the TAO model with the original parameters calibrated for temperate EOM. This study provides a validation/extrapolation of TAO from temperate and dry tropical EOM to those originating from humid tropical conditions. However, a readjustment of the TAO model seems to be necessary to consider the "priming effect" process.