The purpose of this paper is to suggest some of the conditions or reasons that determine the development of experimental phenomenology. The first of these reasons may be found in the positive judgment about this approach that comes from past and recent history of psychology. Other reasons may be found in the three basic aspects of any theory: nature of postulates, objects, and method. A fourth reason is broadly examined in the contribution “On phenomenology of identity and opposition” which follows this paper in the present issue of this journal. It considers the natural development of the discourse started in the present pages, which had its origin in the Veronese project of research on experimental phenomenology.