Blocks are sets of questions within your survey. Typically, questions are separated into blocks for the purpose of conditionally displaying an entire block of questions, or for randomly presenting entire blocks of questions. These branching and randomization options are found in the Survey Flow.
Blocks can also be used to organize longer surveys. For example, the first two questions in your survey might be in a block called “Introduction,” and the rest of your survey questions in a block called “Main Survey.”

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Loop & Merge allows you to take a block of questions and dynamically repeat them multiple times for a respondent.
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Sometimes you need to randomize the order of questions in a block. With Question Randomization, you can do just that—and so much more. Some common options include
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