Published by the Sphere Association, this fourth edition handbook marks 20 years of the Sphere initiative and sets out the Humanitarian Charter, Protection Principles, Core Humanitarian Standard and technical minimum standards for water, sanitation, food security, shelter and health in humanitarian response. Informed by consultation with over 450 organisations across 65 countries, it is a widely referenced resource for practitioners planning, managing or implementing humanitarian responses, with new guidance on urban settings, protracted crises and market-based assistance.