“Never Events” are medical errors that should not occur if strong preventative measures exist. An example in secondary care is wrong-limb amputation. A list of "Never Events" for primary care is being researched in conjunction with clinicians. As a patient and public engagement activity, from personal experience can you think of any events that should never occur in general practice but have done so?
http://blogs.mhs.manchester.ac.uk/primarycare/2013/11/01/never-events-in-general-practice-do-they-exist/
http://bjgp.org/content/64/620/e159.long