In hazardous waste management, solidification/stabilization (S/S) is a term normally used to designate a technology employing additives to alter hazardous waste to reduce the mobility of pollutants, thereby making it acceptable for current land disposal requirements. The use of this technology to treat hazardous waste may become more important as regulations restrict the use of land for disposing of hazardous waste. The paper discusses the technology and provides information to help assess its potential role in managing hazardous waste. Technical and regulatory factors affecting its use are presented.