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The Codes Study is a collaborative effort led by Hazel Borys and Emily Talen, and contributed to by many public and private planners, tracking the prevalence of form-based codes worldwide. As of November 2012, we've tracked 433 codes that meet criteria established by the Form-Based Codes Institute (FBCI), as well as an additional 14 form-based guidelines. 252 of these are adopted, with others in progress. Even though form-based codes are 30 years old, 82% have been adopted since 2003.