Structural Existential Analysis (SEA) is a qualitative research method which uses an existential-phenomenological framework that has been developed through decades of therapeutic and research practice. This book describes the method of SEA and how to apply it to qualitative research. The book starts with a detailed description of the existential underpinnings of SEA, drawing on a range of phenomenologists, to demonstrate the need for a phenomenology of interiority. The method is described in full, explaining the use of a specific form of self-reflection (SOAR) and of the Existential Research Dialogue. The second part focuses on the analysis of the research data. A full description is given of each of the filters, in terms of their origin, their meaning and of the specific ways in which they are applied. The text is enlivened by ample examples demonstrating how the filters can be used and how the analysis can draw out different aspects of human experience throughout the process. The book will be essential reading, for all those involved in education, training or research in existential therapies, clinical psychology and counselling psychology.