This paper aims to make a reflection about phenomenological research from the matter of ethics. The start point is the idea of that, in the investigation of human, ethics comes before epistemology and that, therefore, it would concer to any knowledge of this field to make questions about the place of what is purged by scientific method. It is pointed that such problem happens even with phenomenologically oriented researches, once that often many of them think about the problem of unity, but seldom think about the place of the difference that this unity may contain. It is understood that the concept of intentionality, that put together several phenomenological perspectives, such as Husserl's, Heidegger's, Merleau-Ponty's and Gadamer's, brings on itself questions that wrap the relationship between universal and particular, as well as ethical nuances, but there is not an operational description of how these questions become concrete in empirical research. As a solution to this problem, it is suggested a pragmatic-ethical solution, so that researcher must explain more clearly and operationally how phenomenological principles affect the research (pragmatic dimension), as well as it is also suggested that he must evidence the historical-relational dimension from wich he produces knowledge. Therefore, it is believed, it keeps preserved historicity and temporariness contained in the construction of knowledge.