Most countries and their legal systems, consider a profession to be a vocation which requires specialised educational training resulting in a recognised qualification. This means the qualified professional can provide a specialised service to others for which they are compensated accordingly. Many professions also have recognised bodies which set codes of conduct, standards and duties of care which their members should reach in their everyday working.
Below shows a list of the types of professional who are considered to have specialist knowledge over and above that of an average person, so if they do not show the required duty of care, they may be considered to have acted negligently.