The new product development and correct market segmentation are fundamental to define marketing strategy in order to provide a competitive advantage. To do this, the perfect understanding of customer needs is essential, too. In this research, the conjoint analysis theory is used with the objective of showing the group of characteristics understood as desirable by consumers to buy credit cards. This work is composed of two main basic steps: the choice of the attributes to be evaluated by the respondents and the analysis of this evaluation. The group of stimuli to be evaluated was chosen based on in-depth interviews and one focus group. The group of stimuli was developed using SPSS 11.0 software for Windows. Data collection was implemented with questionnaires sent by email. Some of them were handled personally. In the last step, also using the SPSS 11.0 software for Windows, this study reached its objective, identifying the concept of product considered the most adequate, as a result of the stimuli combination, which generated the highest utility level.