Discussing and understanding all MERCOSUL's issues and its wide range reality is definitely relevant since it embodies every segment of society. The preliminary study is meant to provide for healt professionals, mainly the nursing, basic data on the tratado de assunção - a Treaty signed by Brazil, Argentina, Uruguay and Paraguay which form the so called CONESUL - defining objectives, peculiarities and welfare facilities as well as their work field. The integration has already started on. Actually we can assume that it has been effective on the part of economics, yet all its relations are to consolidate in 1995. Nevertheless that should not prevent all segments from moving. As a matter of fact, being aware and open to any initiative from their peers, some of the welfare practitioners have tried to stand by then even though in a rather haphazard way.