The problem of contamination to land and groundwater from improper handling of hazardous materials/waste is faced by all countries. Also the need for reliable, cost-effective technologies to address the problem at contaminated sites exists throughout the world. Many countries have only started to develop new innovative/alternative technologies while others have already started to apply these technologies to the cleanup of contaminated sites. The purpose of the NATO/CCMS Pilot Study is to discuss and evaluate new innovative/alternative technologies and/or existing systems that may be applicable to the cleanup of contaminated sites. Through the pilot study the exchange of information on new and existing technologies for dealing with problem hazardous waste sites is promoted. The pilot study is made up of an international group of experts drawn from the participating countries. The study, which was initiated in 1986, is planned to last five years. It is piloted by the United States and copiloted by the Federal Republic of Germany (FRG) and the Netherlands. The report includes an overview and history of the NATO/CCMS Pilot Study, but it primarily presents a documentation of the NATO/CCMS Second International Conference on the Demonstration of Remedial Action Technologies for Contaminated Land and Groundwater held in Bilthoven, the Netherlands on November 7-11, 1988. (Copyright (c) 1989, Air & Waste Management Association.)