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Training is divided into three major categories : personal management , communication skills , and low vision follow-up . Typically , existing land uses can be identified as falling into three major categories : residential , commercial , or industrial . In two other categories , the analysis appeared to reveal a disturbingly high preventable death rate among young patients . Often times , taxpayers group all research in one broad category and do not identify the specific business component to which the business relates . They can be grouped into four main categories : concession / permitting agencies ; planning agencies ; environment and natural resource management agencies ; and monitoring agencies . The database is organized in 16 main categories , and the data is entered and managed by the researcher ( or the research organization ) participating . The Continua Health Alliance efforts will be focused on three major categories : chronic disease management , monitoring the health and healthcare needs of aging people and proactive health and fitness .