— Achieve your WSET diploma Certification

WSET Level 4 Diploma in Wines

Commonwealth Wine School’s WSET Level 4 Diploma is a rigorous, two-year pathway designed to take WSET Wine Level 3 graduates into elite, professional-level wine knowledge and analytical tasting. With six assessed units and the flexibility to study in person, online, or hybrid, you can pace the program around real life while still staying tightly aligned to WSET expectations. What sets Commonwealth Wine School apart is the built-in support—**examiner-reviewed feedback exams, expert faculty (including Masters of Wine and other industry leaders), and personalized planning—**so you go into each assessment prepared and confident.
WSET Diploma - D1 Wine Production Certification
— Achieve your WSET Diploma in Wine

WSET Level 4 Diploma in Wines - Unit D1: Wine Production (WSET Diploma)

WSET Diploma D1 Wine Production at Commonwealth Wine School builds the technical foundation of the Level 4 Diploma by connecting the vineyard and winery to the final wine in the glass. You’ll study what the vine needs to produce grapes for different wine styles, how growing conditions influence quality and price, and the key winemaking and post-fermentation choices that shape aroma, structure, and balance. Commonwealth Wine School’s D1 online/hybrid format includes access to its online study platform, exam-style feedback tests, and direct educator support—so your study stays structured and exam-aligned from day one. Assessment is a 90-minute short written answer exam.
  • Vineyard-to-winery mastery
  • Exam-focused written practice
  • Quality, style, price links
  • Essential Diploma foundation
WSET Level 4 - D2 Wine Business
— Achieve your WSET Diploma in Wine

WSET Level 4 Diploma in Wines - D2: Wine Business (WSET Diploma)

WSET Diploma D2 Wine Business at Commonwealth Wine School focuses on how wine moves from vineyard to market—pricing, routes to consumer, and the commercial realities that shape what ends up on shelves and lists. You’ll explore the economics of production and distribution, sales and marketing strategies, and the legislative and political factors that affect supply, demand, labeling, duties, and pricing. Commonwealth Wine School’s course structure is designed to help Diploma students master the business language WSET expects, with platform-based study support, feedback tests that mirror the exam style, and faculty access for guidance. Assessment is a 1-hour short written answer exam.
  • Industry economics explained
  • Real-world strategy insights
  • Pricing and routes-to-market
  • Strong exam answer structure
WSET D3 Wines of the World
— Achieve your WSET Diploma in Wine

WSET Level 4 Diploma in Wines - D3: Wines of the World (WSET Diploma)

WSET Diploma D3 Wines of the World is the flagship product-knowledge unit—where Diploma candidates build the global, analytical understanding needed to explain why wines taste the way they do and how quality and price are determined. You’ll study major regions through the lens of grape growing, winemaking, maturation, law, and business—then apply it in systematic tasting and evaluation. Commonwealth Wine School supports D3 with robust online resources (including region lecture recordings), exam-focused feedback tests, and (in some formats) extensive guided tastings and practice exam work. The D3 assessment is a two-day exam: theory essays plus blind tasting of 12 wines.
  • Global region deep dive
  • Theory-to-glass integration
  • Advanced blind tasting skill
  • Two-day exam readiness prep
D4 Sparkling Wines - WSET Diploma
— Achieve your WSET Diploma in Wine

WSET Level 4 Diploma in Wines - D4: Sparkling Wines (WSET Diploma)

WSET Diploma D4 Sparkling Wines at Commonwealth Wine School is a focused, advanced study of the world’s principal sparkling wine styles—how production methods, regional conditions, and business realities influence style, quality, and price. Coverage spans key sparkling categories across major producing countries, with tasting practice designed to sharpen comparative analysis and exam-ready conclusions. Commonwealth Wine School offers an online study path and a combo option that can include an optional in-person tasting + theory workshop built around exam-style flights and practice theory work. Assessment is a 90-minute exam combining blind tasting and short answers.
  • Method and style precision
  • Worldwide sparkling coverage
  • Tasting + short-answer prep
  • Confidence in typicity
WSET D5 Fortified Wines
— Achieve your WSET Diploma in Wine

WSET Level 4 Diploma in Wines - D5: Fortified Wines (WSET Diploma)

WSET Diploma D5 Fortified Wines delivers a thorough, professional-level understanding of fortified wine production and the classic regions that define the category. You’ll study the techniques behind major fortified styles, the regional factors that shape typicity, and the labeling/business concepts needed to evaluate quality and price with confidence. Commonwealth Wine School’s Diploma pathway supports candidates with structured study resources and exam preparation, and the D5 assessment is designed to test both tasting accuracy and theory clarity. Assessment is a 90-minute exam combining blind tasting and short answers, with course options commonly offered online and in combo formats.
  • Production techniques mastered
  • Classic regions made clear
  • Blind tasting confidence
  • Exam-ready short answers
WSET Level 4 Diploma - Research Paper
— Achieve your WSET Diploma in Wine

WSET Level 4 Diploma in Wines - D6: Research & Analysis Assignment (WSET Diploma)

WSET Diploma D6 is the capstone-style research unit that builds advanced professional skills: critical reading, evidence-based argument, and clear industry writing. Instead of a traditional exam, candidates complete a research assignment on a defined annual topic using WSET-provided source materials and guidelines. Commonwealth Wine School offers D6 topic intakes on a scheduled timeline—recent examples include Wine Fraud (Topic 1) and Orange Wine (Topic 2)—with clear deadlines and submission requirements tied to the WSET brief. It’s ideal for students who want to demonstrate thought leadership and structured analysis alongside tasting and theory mastery.
  • Critical thinking showcase
  • Professional wine writing skills
  • Evidence-based topic analysis
  • Capstone-style credential boost
— Our courses

Education & course content highlights

We ensure our staff trainings can deliver value when and how our trainees need—whether that be with the support and guidance of instructors or independently and remotely.

Connect with us

Who we are

Napa Wine Class is more than just a knowledge base—it's a passionate movement to share the beauty, culture, and craftsmanship of Napa Valley with the world. 

Featured links

Get in touch

  • 1300 First Street, Suite 368 Napa, CA 94559
  • mbv@napawineclass.com
Disclaimer:
All content provided by MBV Wine Media—including but not limited to courses, videos, articles, webinars, digital guides, and instructional materials—is intended solely for educational and informational purposes. No alcoholic beverages are sold, served, promoted, or provided through any part of this program. The inclusion of wine-related information, tastings, or evaluations does not constitute an offer to sell, advertise, or solicit the purchase of alcoholic beverages. Any references to wines or tasting rooms are for academic discussion only and are not intended to encourage or facilitate commercial transactions.

Napa Wine Class is a digital content hub curated by MBV Wine Media, an independent wine education platform.
© 2025 Vescovi Industries, LLC – All rights reserved. Produced by MBV Wine Media.