This book has the difficult task to cover an interdisciplinary area in which psychoanalysis has to deal with infant research. The development of infant research methodologies is illustrated in the present book by the contribution written by Beatrice Beebe, whose ÔjourneyÕ leads us through the ÔcreatingÕ of a discipline with its creators, her traveling companions, such as Daniel Stern, Frank Lachmann, Joseph Jaffe and many others. TrevarthenÕs chapter is a discussion of his work with T. Berry Brazelton, passed away on March 2018. TronickÕs contribution focuses on mother-infant dyad as well as on analyst-patient one, conceived as open dynamic systems, capable of meaning making, in which coherence is at best imperfect, and coordination alternates with mismatching. Lyons-Ruth and colleaguesÕ chapter is focused on the representational world of the mother, particularly on the assessment of motherÕs representation of role-confusion in her relation with her child.