A double barreled question is when you combine two questions into one. Survey creators will do this in an effort to reduce the number of question in their survey. Unfortunately, they're also drastically reducing the reliability of the collected survey data and the types of conclusions that can be drawn from survey data analysis. Like our other survey question pitfalls, you've probably seen examples in consumer questionnaires and employee feedback surveys you've been asked to complete.

I find double barreled questions are the easiest of the pitfalls to spot and correct.