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This section of the Handbook is organized in the following categories:
Within each chapter (category), the design elements being presented are listed. This listing is then followed by a concise discussion summarizing the key issues for the aging population. Then, for each design element, the treatments being recommended are presented. After all of the numbered design elements are presented, then the "Promising Practice" treatments are provided. These are treatments that designers and engineers should consider, recognizing that these are being used by one or more agencies, which, though they have not been evaluated formally, are generally believed to benefit the aging population based on a subjective assessment by staff participating in the development of the Handbook.