My assumption in survey design was to put the Net Promoter question as near to the front of the survey as possible, typically after the survey taker has gone through the screeners. However, I have run across other surveys where the NPS question is one of the last questions asked. My sense is that asking the question up front prevents bias that could occur when a survey taker reads and responds to the additional questions. I would like to hear other's opinions on where this very important question should be located in the survey flow and reasons why?