Part 1. Social Exclusion as a Psychosocial Problem, and Psychology as a Critical Part of the Response. Section 1. Understanding the Problem. 1. Social Exclusion, Complex Needs and Homelessness. Peter Cockersell. 2. Compound Trauma and Complex Needs. Peter Cockersell. 3. The Process of Social Exclusion. Peter Cockersell. Section 2. Solutions: Principles of Practice. 4. A Psychological Perspective on Recovery. Peter Cockersell. 5. Applying Psychology as a Response to the Impact of Social Exclusion: PIE and Psychotherapy in Homelessness Services. Peter Cockersell. Part 2. A Psychological Perspective on Social Exclusion in Practice and Experience. Section 3. Solutions: Practice and Experience. 6. My Experience of Homelessness: My Journey = Thankfulness/Education. Mariana Stunner. 7. Pre-treatment Therapy Approach for Single Homeless People. John Connolly. 8. Psychotherapy with Homeless Women. Nicola Saunders. 9. PIE-oneering Psychological Integration in Homeless Hostels. Dr Emma Williamson. 10. PIE: What the People Say. Catriona Reid. 11. Streetlight: Homeless Psychotherapy in Britain's Happiest Town. Dr Sally Read. 12. I Held the Ticket in My Hand. Terry Hutton. Part 3. Psychology Applied to the System of Care. Section 4. Conclusion: Contextualising the Problem and Responses in the Culture and System of Care. 13. The Problem and Potential of Complexity. Peter Cockersell. 14. The Treatment of Multi-Morbidity. Peter Cockersell. 15. The Dependency Paradox. Dr Emma Williamson.