Complete Vocal Institute (often abbreviated to CVI) is an educational institution, located at Øster Voldgade 8 in Copenhagen. The Institute was opened in 2005 and uses a teaching method called Complete Vocal Technique (often abbreviated to CVT), which was developed by singer and voice researcher Cathrine Sadolin. CVI educates professionals and semi-professional singers and teachers and there are ongoing about 250 singers (2012) associated with the longer courses.