Opinions often change from year to year, or even day-to-day based on various circumstances and characteristics. What is true of your target audience one year may be different the next.
In a tracking study, the same questions are asked over a period of time, whether it is an election poll which may be tracked from day to day, or a customer satisfaction study which may be tracked annually.
Avant Research Group conducts numerous tracking surveys for satisfied customers, and has extensive experience and authority in their correct implementation. It is important that questions in the study are worded and asked in exactly the same order and manner each time, and that the sample file is devised using the same methodology, to be confident that the survey has been tracked correctly.