Since 2015, the CAU/BR has been one of the main articulators and promoters of affordable housing in Brazil, through the promotion of Technical Assistance in Social Housing (ATHIS), as a professional practice and State Policy. From the dissemination of the Federal Law No. 11.888/2008 (ATHIS law) among the population and the public sector, CAU/BR have financed and disseminated successful experiences throughout the country.