The necessity of the cientificity in the nursing's working process, pushed by the science's advance and enclosure in the job market, configured itself in the establishment of nursing's process. The purpose of this study was to analyze in the nursing's legal documents, the nurse's duty opposite the Brazilian society, in the perspective of the scientific methodology in the working process. In a historic approach, the laws and designation-laws that normalized the nursing usage in the period that the nursing process was being introduced in Brazil. We detected in the results that the nurses in the 1960's up to the 1980's saw themselves being pushed by the universities' contradictory collections, by the job market and the professional's exercise law, combining the administration care planning supervision and teaching.