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With a rapid increase of a population rate of the elderly, disabled people also have been increasing in Japan. Over a period of 40 years, author has developed a basic research approach of assistive technology, especially for people with seeing, hearing, and speaking disorders. Although some of the required tools have been practically used for the disabled in Japan, the author has experienced how insufficient a function of the tools is for supporting them. Moreover, the author has been impressed by how amazingly potential ability of the human brain has in order to compensate the disorders.