This book proposes and explores a novel conceptualisation of the grieving process grounded in evolutionary psychology that integrates cognitive behavioural approaches such as compassion focused therapy, metacognitive awareness, and acceptance and commitment therapy.

Starting with an introduction of the historical and theoretical basis for the Principles of Loss model, the book then outlines methods of assessment and describes the processes of formulation and case conceptualisation, with specific guidance on how to navigate these in the context of loss. The book provides an in-depth exploration of the Five-Phase Principles for the Treatment of Loss and Grief (intervention), as well as guidance on the supervision of loss. The chapters, accompanied by case studies, provide an overview of the novel model, followed by specific and tailor-made guidance on assessment (including a novel self-report measure), formulation, treatment, and supervision.

This guide is intended for clinicians familiar with or interested in the theory and practice of third-wave cognitive behavioural therapies.