This Book Offers A Broad Critical Study Of Heidegger's Lifelong Effort To Come To Terms With The Problem Of Phenomena And The Nature Of Phenomenology: How Do We Experience Beings As Meaningful Phenomena? What Does It Mean To Phenomenologically Describe And Explicate Our Experience Of Phenomena?the Book Is A Chronological Investigation Of How Heidegger's Struggle With The Problem Of Phenomena Unfolds During The Main Stages Of His Philosophical Development: From The Early Freiburg Lecture Courses 1919-1923, Over The Marburg-period And The Publication Of Being And Time In 1927, Up To His Later Thinking Stretching From The 1930s To The Early 1970s. A Central Theme Of The Book Is The Tension Between, On The One Hand, Heidegger's Effort To Elaborate Husserl's Phenomenological Approach By Applying It To Our Pre-theoretical Experience Of Existentially Charged Phenomena, And, On The Other Hand, His Drive Towards A Radically Historicist Form Of Thinking.