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The Difference Between Piping and Pre-Population

Both of these methods allow the survey creator to insert data dynamically into a survey. Piping is used when you want to take data from user input and use that in the survey. Pre-population is used when you want to take data from your invitee attributes and use that in your survey.

Opinio defines pre-population in their online manual. Piping is also described in their online manual.