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Vermistabilization, also known as vermicomposting, is a biodegradation process for stabilization of biosolids and organic solid wastes using earthworms. The worms maintain aerobic conditions in the organic substances and accelerate and enhance the biological decomposition of the organic substances. This chapter introduces and reviews the vermistabilization process. The technology development, technical problems, legal problems, technology breakthrough, current status, available resources, engineering design, and recent advances of the process are discussed in detail.Key Words vermistabilization r vermicomposting r earthworms r composting r biosolids r organic solid wastes r sludges r sludge disposal r biosolids management r solid waste disposal r engineering design r flow diagram.