This article was written on the occasion of the Greek translation of René Kaës' book A Singular Plurality. Psychoanalysis Facing the Challenge of the Group. The book was simultaneously published in English under the title Linking, Alliances and Shared Space. Groups and the Psychoanalyst.

The article is a modest contribution to the familiarization of psychoanalysts with the psychoanalytic thought of René Kaës.

The important stages of the author's itinerary having been traced and his fundamental hypotheses explained (the group psychic apparatus and the psychic groupality), there follows a review of most chapters in the book.