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The Barrier Analysis tool is a rapid assessment tool used in community health and other community development projects to better identify barriers to behavior change that would have a significant positive impact on the health, nutrition, or well-being of targeted groups in a project area. 

This report assesses the relationship of household crowding to various health effects. A systematic review of this topic was conducted to support the development of the World Health Organization’s (WHO) Housing and health guidelines. The aim of this systematic review is to provide the best available evidence from existing research to contribute to the deliberations of the Guideline Development Group (GDG).