The central topic of the present research is the study of the technological organization of nursing work in the Basic Network of Health Services of Ribeirão Preto. The objective has been to characterize nursing work and its articulation which the services provided at Basic Health (BHUs) and to identify the purposes that are fulfilled by this work. The moments of health work have been characterized by direct observation of the service sectors and by interviewing the professionals involved. Three BHUs have been selected and observed over a period of 3 consecutive months in the sectors of: client reception, pre-visit, medical visit, after-visit, vaccination, feeding supplementation, application of treatment and nursing work. It has been concluded that the activities are directed at the medical visit as individual care, and the nurse is involved in this working process by performing activities that complement the medical visit. The predominant health model is First Aid, with no development of collective health actions