The Australian Wine Research Institute > Services to Industry > Winemaking > Sensory assessment > Sensory difference methods > Duo-trio

Duo-trio

Test Duo-Trio
Min. Tasters1 7
Use Comparison to a reference wine
Samples One reference sample (Ref)
Two coded test samples (A,B)

A is the same wine as the reference (control wine)
B is the wine to test
Tasting sheets Click here
Basic method Tasters assess the reference (Ref), then the two test samples (A,B).
Tasters are asked to indicate which test sample is the same as the reference.

Possible serving orders3: Ref,A,B; Ref,B,A
Example:

Results:

  • correct responses = 7
  • total responses = 7
  • significant difference for 7/7 = yes
Results Are the wines significantly different?

Correct response – Taster picks A as the same as the reference.
Significance – Required no. of correct/total responses2:
Single tasting: 7/7 7/8 8/9 9/10
Repeated tasting: 10/12 11/14 12/16 13/18
Notes:
1 Indicates the minimum number of tasters required for testing to achieve a statistically significant result (p < 0.05).
2 Figures denote minimum number of correct responses required out of the total number of responses to conclude the wines are significantly different from each other.
3 Serving orders denote possible arrangements of the samples to be presented randomly to tasters.