"The Sphere Handbook is marking its 20th anniversary with the publication of this fourth edition. It is the result of an intense year-long mobilisation of humanitarian actors around the globe and reflects two decades of experience using the standards in front-line operations, policy development and advocacy to uphold principled quality and accountability. With a clear, rights-based framework, the Handbook builds on the legal and ethical foundations of humanitarianism with pragmatic guidance, global good practice and compiled evidence to support humanitarian staff wherever they work." (Foreword)