In the past year, there has been a dramatic maturation of intrinsic bioremediation technologies. As methods pertinent to the intrinsic bioremediation of fuel hydrocarbons have become better established, a comprehensive protocol has been developed for the validation and prediction of these processes. Study of intrinsic bioremediation of other prevalent contaminants, such as chlorinated aliphatics, polychlorinated biphenyls, and high explosives, has also been undertaken.