3rd edition. Patient safety standards are critical for the establishment and assessment of patient safety programmes within hospitals. This third edition of the Patient safety assessment manual provides an updated set of standards and assessment criteria that reflect current best practice and WHO guidance. The manual will support the implementation of patient safety assessments and improvement programmes within hospitals as part of the Patient Safety Friendly Hospital Framework to ensure that patient safety is prioritized and facilities and staff implement best practices. The manual is a key tool for use by professional associations regulatory accrediting or oversight bodies and ministries of health to improve patient safety.