AbstractExpert software‐based decision support is speeding the process of defining environmental hazards and identifying remedial responses for the U.S. Department of Energy's (DOE) hazardous waste cleanup projects throughout the United States. Pacific Northwest Laboratories' (PNL) Remedial Action Assessment System (RAAS), and associated Technology Information System (TIS), written for Macintosh computers (soon for PC‐compatible computers), sort through an encyclopedic data base to help environmental engineers prepare the most appropriate remedial strategy. The system has been available to DOE and other U.S. government engineers since last year and will soon be commercially availa