Essential reading for Best Interests Assessor (BIA) students and practitioners, this fully-updated handbook gives practical advice on the legal aspects, values and practice elements of the role. It takes account of recent legislative changes, including the Mental Capacity Amendment Act 2019, recent case law and the impact of the COVID-19 pandemic on BIA practice and, looking forward, considers the new context for practice in the Approved Mental Capacity Professional (AMCP) role within the Liberty Protection Safeguards (LPS) framework.