CMS Deductive Wine Tasting Grid

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The Court of Master Sommeliers (CMS) Deductive Tasting Grid is the most rigorous blind tasting methodology in professional wine education. It requires the candidate to move systematically from observation through analysis to a specific, defensible conclusion: one grape variety, one country, one region, one quality level, one vintage. At the Master Sommelier level, candidates have approximately 25 minutes to taste six wines and deliver spoken deductions with reasoning at every step. The method is deductive, not inductive. Every conclusion must be reached by arguing from structural evidence — acid levels, tannin quality, colour depth, aromatic development — not from familiarity or guessing. A candidate who identifies a wine correctly without the correct structural argument scores no points. The discipline of the grid forces intellectual rigour: you must be wrong in specific, defensible ways rather than vaguely right. The grid has five sections: Appearance, Nose, Palate, Initial Conclusion, and Final Conclusion. Each section narrows the logical field. By the time you reach Final Conclusion, you should have eliminated 90% of possibilities on structural grounds alone. The final answer is not a guess — it is the only surviving hypothesis.

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