Acknowledgements. Abbreviations. Introduction. Natural Attitude and Everyday Life. 1. Objects in the Lifeworld. 2. Subjects in the Lifeworld. 3. 'Inside' or 'Outside' the Natural Attitude. 4. The Thesis of the Natural Attitude. 5. Anxiety. The Question of Constitution. 1. The Need for the Question of Constitution. 2. The Epoché. 3. The Transcendental Reduction. 4. The Noematic Correlate. 5. Reduction and Constitution. 6. Constitutive Phenomenology. The Question of Being. 1. The Need for the Question of Being. 2. Phenomenology. 3. Husserl's Epoché. 4. Formal Indication. 5. Fundamental Ontology. 6. The Destruction of the Ontological Tradition. 7. Phenomenological Ontology. World. 1. Object-Intentionality and World. 2. World as Horizon. 3. World as a Referential Whole. 4. The Phenomenon of World. Subjectivity. 1. Intersubjectivity. 2. Transcendental vs. Mundane Some Initial Considerations. 3. Some Initital Considerations. 4. Transcendental Subjectivity and the Body. 5. Subjectivity. Constitution, Transcendence and Being. 1. Understanding of Being and Intentionality. 2. Constitution and Transcendence. 3. Understanding the Being of Some Clarifications. 4. The Being of Equipment. 5. The 'Mundane' Subject. 6. The Being of Subject. Conclusion. Bibliography. Index of Names.