Logic rules helps to create a "path" for respondents to avoid irrelevant questions.
Logically linked questions only appear when their trigger choices are hit. Otherwise, these questions are hidden for all respondents.
Let's see an example below:
1. Do you prefer juice or alcohol beverage?
A. Juice (trigger question 2)
B. Alcohol beverage (trigger question 3)
2. Which of following juice do you prefer? (Appear when respondents select choice A in question 1)
A. Orange juice
B. Tomato juice
C. Apple juice
D. Grape juice
E. Watermelon juice
3. Which of following alcohol beverage do you prefer? (Appear when respondents select choice B in question 1)
A. Beer
B. Wine
C. Sorghum
D. Sake
E. Whisky