Auditor reporting on going-concern-related uncertainties remains one of the most challenging issues faced by external auditors. Business owners, market participants and audit regulators want an early warning of impending business failure. However, companies typically do not welcome audit opinions indicating uncertainty regarding their future viability. Thus, the adutor's decision to issue a ''going concern opinion'' (GCO) is a complex and multi-layered one, facing a great deal of tension. Given such a rich context, academic researchers have examined many facets related to an auditor's decision to issue a GCO. This monograph review and synthesizes 182 recent GCO studies that have appeared since the last significant review published in 2013 through the end of 2019.