This study detaches the importance of the perception of the customer in the process of evaluation of the nursing assistance. Through of bibliographical study research in the period understood between 1990 and 2004. This study reviewed on customer's satisfaction, where had been identified to concepts and publications that approached the perception of the customer as important factor in the evaluation of the nursing assistance. Thus, concluding, that customer has important paper in the attainment of the resulted real of the offered assistance, therefore characterizes as source of opinions and suggestions assisting in the process of evaluation.