A study was undertaken by Environment Canada, in conjunction with the US Environmental Protection Agency (EPA), Alberta Environment and 15 industrial participants involved in developing or marketing solidification technology, to develop and validate 16 laboratory test methods for evaluating the physical and chemical properties of solidified wastes. Environment Canada and the US EPA provided the 15 industrial participants with 5 untreated hazardous wastes, which were then treated with their proprietary processes and returned as solidified products to 4 laboratories in Canada and the US for testing. Seven physical tests, 5 leaching tests, and 4 micromorphological characterization methods were applied to the solidified products.