This paper proposes an assessment model of putative embryos for in vitro fertilization (IVF) based on a triangular norm. One of the most common difficulties of IVF treatments is multiple pregnancy. Therefore the number of embryos for transfer is of paramount importance considering the need to reduce the incidence of multiple births without compromising overall pregnancy rates in fertility treatments. Consequently the selective embryo transfer is recommended to optimize efficacy and safety outcomes. The embryo evaluation is of enormous relevance, since it directly affects the success of different techniques used in assisted reproductive technologies (ART). The gathering of all the information needed to embryo evaluation, as well as software that can serve as aid in the decision is of great importance. The tool herein presented accomplishes these two objectives. The analysis of the requirements of the assessment process has resulted in a flexible data model, used in the presented prototype, supporting the selective embryo transfer decision-making process.