Abstract : The primary objective of this study was to determine the extent to which TNT and RDX concentrations are reduced by composting under controlled conditions in the laboratory over a period of six weeks. A second objective was to determine if bench-scale composting studies accurately simulate the activity of a larger-scale compost by comparison of parallel studies monitoring TNT and RDX disappearance in laboratory scale (50 g dry weight) and greenhouse (10 kg dry weight) composts. An additional objective was to determine the leachability of TNT or RDX from compost. -BKA