Encyclopaedia Britannica's Editors oversee subject locations through which they have got extensive expertise, no matter whether from years of working experience acquired by focusing on that content material or by means of examine for a complicated degree. They write new material and confirm and edit material been given from contributors. https://docs.google.com/document/d/1W0ShhpcAOXiVh7MGIbrAN3NopacQ98m3oU0LniQtEz0/edit?pli=1#heading=h.6v9pgudbm743