As public opinion polling increasingly moves toward the use of online panels, one threat that pollsters face is the possibility that their data could be damaged by interviewing the same set of people over and over again. The concern is that repetitive interviewing may introduce panel conditioning, a state in which panelists change their beliefs or behavior just by being exposed to and answering a variety of questions over time. CONTINUED
Ashley Amaya, Nick Hatley & Arnold Lau, Pew Research Center