Due to globalized economy the trade union movement more and more needs to look for ways to work across national and sectoral borders. In BOA 32 different organisations from seven nations are contributing directly either financial or human resources. BOA helps the participating unions to organise new, active members and organisers heedless of national and sectoral boundaries. The story focuses on the choices and activities that made the program into what it is today and gives practical hints how to organise implement similar programs