A 3AFC Test can be used in many cases. Some clients use this to minimize the number of codes required in a triangle test. For all discrimination tests, two samples at a time are used.


  1. When creating a new 3AFC test, select the following settings for the questionnaire:
    • Questionnaire Type: Discrimination
    • Discrimination Test Type: nAFC
    • Total Number of Stimuli: 3
    • Sample Entry Mode: Confirm (recommended)



  2. Select Two Samples (at a time) and Click Add. The samples will appear on the right hand-side under Servings.



  3. Click Submit

  4. Click Add Questions

  5. Update the text as desired. 
    • Typical verbiage includes the following: "In front of you are three coded samples, two are the same and one is different. Starting from the left evaluate the samples and select the code that is different from the other two. You may retaste as often as you wish. You must make a choice."
    • Click Save to save the questionnaire updates.
    • Close the Survey.

  6. Click Next to move onto Design Block.

  7. Click "NO CTRL." in the design block to set a sample as the control product. 
    • Note that the design will not load until the Control product has been selected.
  8. Select the sample that will be the Control product. 
    • Control is the sample that will be evaluated twice.

  9. Click Submit and the design will build.

  10. Click Approve


  11. Click Actions > Edit Blinding Codes


  12. You will see two codes for each sample. 
    • The Control sample selected in Step 8 will use BOTH blinding codes listed. 
    • The non-selected sample will use only the FIRST blinding code listed.
    • Codes 517 and 770 will be used for Control, only 630 will be used for Control + 10% Sucrose.
    • Code 856 will NOT be used in this test.