Infertility is an increasing problem in many societies. Despite advances in evaluation and treatment achieved in this field, success rate of assisted reproduction is still below 30%. Implantation failure becomes a cause of considerable frustration and disappointment for clinician, embryologist and couple concerned. This book provides an update overview of this condition. It exposes the most recent knowledge concerning physiological and pathological aspects of implantation. It revives the concept of dialogue between embryologist and infertility specialist which should reflects the harmony between embryo and endometrium.This volume also shares evaluation and treatment strategies cited in the literature .It updates the knowledge of specialists concerning this intriguing topic and will be very helpful in dealing with with this condition.