Our investigation aims to research how the notion of trauma was described in Sándor Ferenczi s works and to relate his contributions to Michael Balint and Donald Winnicott s later developments. To achieve this objective, in the first part of this investigation, we will introduce the notion of trauma in both Sigmund Freud and Ferenczi s works, aiming to highlight their key differences. We will then discuss the main technical adjustments proposed by Ferenczi. Based on this discussion, in the second part, we will investigate the manner through which Balint redefines the early moments of the constitution of subjectivity, based mainly on his notions of primary love and basic fault. This new approach will lead us to a revision of the psychoanalytic technique, whereby the identification and clinical handling of clinical phenomena are referred to the early moments of the constitution of the ego. In the third part, we will discuss Winnicott s understanding of the traumatic experience, conceived as a reaction to environmental flaws, as well as the effects that these flaws will have on the process of emotional maturation. We will study the manner through which Winnicott defines the analytical setting, clinical handling of regressions in analysis and the use of interpretations. Finally, in the fourth part of this thesis, we aim to extract, from these authors, key elements that could be used as theoretical and clinical references for defining the specificities regarding the approach of cases pertaining to early trauma in psychoanalysis.