( d ) Subregional activities for development in Southern Africa 91 . The work of the ECA Subregional Office for Southern Africa ( SRO-SA ) during the past year was geared towards strengthening the capacity of member States and the SADC Secretariat to formulate and implement harmonized macroeconomic and sectoral policies in several priority areas in order to enhance regional integration , with particular emphasis on achieving social development objectives and integration in the subregion .