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. Additionally, this course offers online, instructor-led lectures on Zoom by American Wine School educators. The D1 exam is a  90-minute written exam.