Patient safety is a serious global public health issue. In recent years, countries have increasingly recognized the importance of improving patient safety.
Estimates show that in developed countries as many as one in 10 patients is harmed while receiving hospital care. The harm can be caused by a range of errors or adverse events. In October 2004 WHO launched the world alliance for patient safety in response to WHO Assembly of 2002 urging WHO and members States to pay the closest possible attention to the problem on patient safety