This course is for those who have earned the WSET Level 3 in Wines. It is the first course and exam toward the WSET Level 4 Diploma in Wines award.

The virtual D1 Diploma course focuses on vinification and viticulture. The course includes the Diploma D1 eBook and online activities and quizzes led by WSET. It differs from the American Wine School Virtual WSET classes in that there are no set dates and times for lecture classes. The D1 exam is a  90-minute written exam.